Explosive debris volcanic eruptions. Medical search. Frequent questions

Located in the Pacific's "Ring of Fire," a seismically active region prone to earthquakes and volcanic eruptions, Taal is among two dozen active volcanoes in the Philippines. (americares.org)
Two volcanoes along the edge of the north Pacific had explosive eruptions over the weekend. (scienceblogs.com)
Explosive volcanoes which give rise to large explosions which can partially destroy the volcano, project high columns of rock materials (rock debris, rock blocks, ash, steam, etc.) in the atmosphere and subsequently falling down along the sides of the volcano, as well as generating lava flows, mud and debris flows along the sides of the volcano, earthquakes and noxious gas emission. (besafenet.net)
Volcanic eruptions occur in areas where volcanoes are still active and where there are human settlements and activities. (besafenet.net)
Steep, conical volcanoes built by the eruption of viscous lava flows, tephra, and pyroclastic flows. (usgs.gov)
Scientists can forecast volcanic eruptions, but volcanoes are unpredictable as their behavior can change. (yahoo.com)
The Smithsonian Institute said scientists monitor volcanic behavior and historic patterns to forecast volcanic eruptions, but "few volcanoes maintain the same behavior for long (more often than not, as soon as a repetitive pattern becomes apparent, the volcano changes behavior). (yahoo.com)
The Smithsonian Institute's Global Volcanism Project said in 2023, there are 56 active volcanoes with 56 total eruptions. (yahoo.com)
In 2022, there were 80 active volcanoes with 85 total eruptions. (yahoo.com)
In 2021, there were 76 active volcanoes and 81 total eruptions. (yahoo.com)
Eruptions and lava flow from submarine volcanoes allow volcanic islands to grow and develop thriving ecosystems. (nationalgeographic.org)
Volcanoes are multi-hazard environments with eruptions rarely resulting in just a single hazard. (bgs.ac.uk)
Mount Sakurajima is one of the world's most active volcanoes , with hundreds of years of recorded eruptions. (livescience.com)
Many frequently erupting volcanoes, like Hawaii's Kilauea volcano, gush basalt, a liquidy lava that has trouble holding onto the gas bubbles that cause explosive eruptions. (livescience.com)
These audible explosions are common during eruptions at Veniaminof (and other similar volcanoes) and atmospheric conditions play a role in whether they are heard in nearby villages. (alaska.edu)
The three andesitic volcanoes at the heart of the park, the mountains Tongariro, Ngauruhoe and Ruapehu, form the southern limits of the Taupō Volcanic Zone, part of the Pacific Ring of Fire. (doc.govt.nz)
But further investigation reveals a mountain made almost entirely of basalt-atypical among stratovolcanoes-and marked by "effusive as well as highly explosive" eruptions-an anomaly among basaltic volcanoes, Safran says. (lclark.edu)
Increases in seismic activity have been detected previously at Trident Volcano and other similar volcanoes and did not result in eruptions. (alaska.edu)

It's safe to say that the explosive volcanic eruption at Guatemala's Volcan de Fuego ("volcano of fire") caught the local population by surprise . (iflscience.com)
The Yellowstone 'super volcano' is a mega disaster eruption just waiting to happen. (modernsurvivalblog.com)
Over the past 2.1 million years Yellowstone volcano has had three immense explosive volcanic eruptions, each with an enormous outpouring of magma and as much as 1,500 cubic miles of ash and debris which covered North America. (modernsurvivalblog.com)
In the event of a Yellowstone super volcano eruption, although the entire planet will be affected, here in the U.S. many of the western and central regions will be horribly affected by deep ash while many eastern regions will fare better. (modernsurvivalblog.com)
Toxic ash and debris spewed from the Taal Volcano on Sunday, triggering mass evacuations, canceling hundreds of flights at Manila's main airport and prompting a "state of calamity" in Batangas province. (americares.org)
Local authorities have also warned of a possible volcanic tsunami in the lake surrounding the volcano, which can be triggered by falling debris after an eruption. (americares.org)
The largest eruption yet has rocked the Caribbean Island of St. Vincent, with the La Soufriere Volcano sending a massive cloud of ash and gas high into the sky. (weatherboy.com)
Unlike ash from a fireplace or a fire pit, volcanic ash is actually pulverized rock, grounded and crunched into a fine, abrasive powder from the extreme forces associated with an explosively erupting volcano. (weatherboy.com)
There isn't much known about the eruptive history of the volcano - checking out the Global Volcanism Program, the last activity at Sinabung might have been an explosive event in 1881 with persistent fumaroles up until 1912. (scienceblogs.com)
However, most news sources are quoting 400 years as the last known eruption of the volcano, apparently information from the Indonesian government. (scienceblogs.com)
As I briefly mentioned earlier, Galeras in Colombia had an "atypical" eruption - apparently meaning it was non-explosive - that has prompted evacuations and a change in the alert status to "Red" for the volcano. (scienceblogs.com)
The Philippine government is upping its concern about an eruption at Taal - and cracking down on tourists and resorts trying to get near Volcano Island in the volcano's caldera lake. (scienceblogs.com)
Now, the Philippine government is taking this threat very serious, sending divers, helicopters, rescue equipment and medical teams to the area near the volcano in case an eruption occurs. (scienceblogs.com)
These eruptions are possible when a volcano is located in areas with large underground water reservoirs, in the sea or in lakes. (besafenet.net)
Notably, the people of Pompeii suffered greatly as the 300 degrees centigrade (572 Fahrenheit) clouds of gas moved down the volcano and seared them alive- when the ash didn't choke them, or the flying molten rock and debris didn't crush, pummel or ignite them. (ancient-origins.net)
This portion The symmetric conical shape of El Misti is typical of a stratovolcano, a type of volcano characterized by alternating layers of lava and debris from explosive eruptions, such as ash and pyroclastic flows. (tempcloudsite.com)
The explosive eruptions of La Soufrière, a volcano in St. Vincent, began on April 9th, 2021, and continued spewing volcanic ash and debris into the atmosphere for weeks - displacing thousands and blanketing forests and towns in many inches of volcanic ash. (ebird.org)
Forty-three years ago, a Plinian eruptive column rose into the sky and volcanic debris rapidly spewed from the volcano. (yahoo.com)
A Landsat 8 image of Sakurajima volcano in Japan, snapped Aug. 19, shows ash from a recent eruption drifting toward the nearby city of Kagoshima. (livescience.com)
Sakurajima volcano in Japan marked its 500th eruption of the year with an impressive pyrotechnic display on Sunday (Aug. 18) at 4:31 p.m. local time. (livescience.com)
The island volcano unleashed a pyroclastic flow, which is a superheated mix of volcanic gas, ash and debris that can race down a slope at more than 200 mph (320 km/h), according to Japan's Meteorological Agency. (livescience.com)
The volcano also stands out for its explosive eruptions, Fee said. (livescience.com)
Vesuvius is the only volcano on European mainland which has erupted within the last hundred years, the last eruption was in 1944, the volcano is considered active and dangerous and is therefor closely watched. (nationsonline.org)
Small eruptions producing minor ash deposits within the vicinity of the volcano are typical of activity during unrest at Semisopochnoi since September 2018. (alaska.edu)
Remote Semisopochnoi volcano occupies the largest, young volcanic island in the western Aleutians. (alaska.edu)
Prior to the 1939 eruption, when an eruption cloud rose 275 m above the ocean and was witnessed by a large number of people in northern Grenada, there had been no written mention of the volcano. (si.edu)
Two relatively recent eruptions from the Taupō Volcano are perhaps the best known. (wikipedia.org)
Tens of thousands of people living within the danger zone (up to 8 kilometers away) of Mayon Volcano in the Philippines were forced to evacuate to emergency shelters in mid-December 2009 as small earthquakes, incandescent lava at the summit, and minor ash falls suggested a major eruption was on the way. (nasa.gov)
On the evening of December 14, the local volcano observatory raised the alert level to Level 3, which means "magma is close to the crater and hazardous explosive eruption is imminent. (nasa.gov)
In September 2007, a series of explosive eruptions altered the summit of the volcano, the only one that erupts natrocarbonatite lava. (nasa.gov)
April 21, 1990 eruption cloud from Mount Redoubt Volcano. (helpsleddogs.org)
Small jagged pieces of rocks, minerals, and volcanic glass the size of sand and silt (less than 1/12 inch or 2 millimeters in diameter) erupted by a volcano are called volcanic ash. (helpsleddogs.org)
However, wind can quickly blow fine ash away from the volcano to form an eruption cloud. (helpsleddogs.org)
PYROCLASTIC : A rapid downhill movement of hot, solid, volcanic particles suspended in steam is STRATOVOLCANO : a volcano that emits lava and solid debris in alternately quiet and explosive eroded. (crosswordspin.com)
The explosion of the bomb mixed with the build-up of pressure inside a volcano could amplify the eruption . (geoscience.blog)
However, previous eruptions of Shishaldin Volcano have lasted weeks to months with repeated cycles of activity like those seen over the last month. (alaska.edu)
AVO issued an Information Statement on July 25 providing a more detailed update on the volcanic unrest at Trident Volcano and the broader Katmai volcanic cluster ( https://www.avo.alaska.edu/news.php?id=1595 ). (alaska.edu)

Rampino proposed the radical idea that some "glacial" deposits in the geologic record are actually impact-related debris flows. (wikipedia.org)
They never have lava flows and even the debris isn't large volume, probably millions of cubic meters rather than the billions (and more) cubic meters of more typical explosive volcanic eruptions. (discovermagazine.com)
Although enlightening, data freely released by satellite company Digital Globe is proving to be especially devastating: comparing pre- and post-eruption images emphasizes just how powerful and deadly pyroclastic flows can be. (iflscience.com)
Pyroclastic flows are a type of pyroclastic density current, mixtures of hot ash, lava, gas, and entrained debris that emerge from explosive volcanic activity. (iflscience.com)
Another explosive event at Fuego could cause similar flows, but plenty of volcanologists are keen to point out that that's not the only danger here. (iflscience.com)
As magma viscosity and gas quantity are the main factors controlling the eruptions, it can be stated that low viscous magmas (basaltic) can produce gentle eruptions with lava flows spreading slowly over large distances. (besafenet.net)
Freshwater Bay Formation on Chichagof Island is composed of green and red andesite and basalt flows, breccia, and tuff, pyroclastic rhyolite deposits, minor amounts of interbedded conglomeratic volcanic graywacke, grayish-black argillite, and dark-gray limestone (Loney and others, 1963). (ianajohnson.com)
Volcanic flows are found throughout the unit and are up to a hundred meters thick (Eberlein and Churkin, 1970). (ianajohnson.com)
Photos show that eruption column had reached 7,300 m above cone and suggest small pyroclastic flows. (si.edu)
Debris flows, also known as lahars when they involve volcanic material, are mixtures of sediments and water that flow down the slopes in response to gravity. (bgs.ac.uk)
In the year 79 AD on 24 August, one day after the annual Vulcanalia festival in honor of Vulcan, the god of beneficial and hindering fire, Mount Vesuvius changed history with a highly explosive eruption, sending for two days rocks, dust, gas and pyroclastic material into the stratosphere at rate of thousands of tones per second, followed by voluminous lava flows, and volcanic ash rain. (nationsonline.org)
Recent bathymetric surveys have shown evidence for a major arcuate collapse structure, which was the source of a submarine debris avalanche that traveled more than 15 km W. Bathymetry also revealed another submarine cone to the SE, Kick 'em Jack, and submarine lava domes to its S. These and subaerial tuff rings and lava flows at Ile de Caille and other nearby islands may represent a single large volcanic complex. (si.edu)
Products of the eruption are described in detail, including eight layers of regionwide fallout, nine packages of ash flows, and three lava domes that followed the explosive pyroclastic episodes. (usgs.gov)
Secondary posteruption phenomena characterized include impounded lakes, ash-rich debris flows, phreatic craters on the ignimbrite sheet, responses of glaciers to the fallout blanket and to beheading by caldera collapse, growth of new glaciers inside the caldera, and gradual filling of the caldera lake. (usgs.gov)
Dark-colored lava or debris flows from previous eruptions streak the flanks of the mountain. (nasa.gov)
Those parts of the surrounding states of Montana, Idaho, and Wyoming that are closest to Yellowstone would be affected by pyroclastic flows, while other places in the United States would be impacted by falling ash (the amount of ash would decrease with distance from the eruption site). (geoscience.blog)
There have been nine periods of elevated eruptive activity resulting in significant ash emissions and mass flows of volcanic debris on the volcano's flanks since the onset of the current eruption. (alaska.edu)
Collapse of accumulated lava near the summit crater can occur without warning and generate hot mass flows on the upper flanks and small volcanic ash clouds. (alaska.edu)

Although it has now quietened down (its eruptive phase was declared over at the end of November, 2021) there was considerable damage to trees and river valleys from pyroclastic material, rocky debris and mudflows. (ebird.org)
No explosive events have occurred since a single event in May 2021. (alaska.edu)

Yes, you read right: Kimberlite eruptions might be rocket ships from the Earth's interior. (discovermagazine.com)
Yellowstone National Park includes one of Earth's largest volcanic-hydrothermal fields, and has an absolutely enormous caldera. (modernsurvivalblog.com)
The Siberian volcanic eruptions and related massive intrusions of nickel-rich magmas into the Earth's crust apparently emitted nickel-rich volatiles into the atmosphere, where they were distributed globally," explains New York University geologist Michael Rampino, the paper's senior author. (wattsupwiththat.com)
So do volcanic eruptions increase the earth's temperature or decrease the temperature? (wattsupwiththat.com)

We report results from a field experiment investigating the influence of volcanic tephra coverage on glacier ablation. (copernicus.org)
For each of the two volcanic tephra types, three plots of variable thickness ( ∼ 1.5, ∼ 8.5 and ∼ 80 mm) were monitored. (copernicus.org)
Volcanically active regions of the world in sub-polar and polar environments episodically experience the deposition of tephra on glacier surfaces after explosive volcanic eruptions. (copernicus.org)
As an example, we have estimated the volumes of tephra fallout deposit that could be remobilized by rainfall-triggered lahars in association with two eruptive scenarios that have characterized the activity of the La Fossa cone (Vulcano, Italy) in the last 1000 years: a long-lasting Vulcanian cycle and a subplinian eruption. (copernicus.org)
Explosive volcanic eruptions can cause gases to escape and tephra - pieces of magma which range from tiny particles to house-size boulders - to move through the air, per the U.S. Department of the Interior . (yahoo.com)
Volcanic debris called tephra was deposited over the pre 1995 lake outlet, to form a barrier which became a dam since the lake rose higher than the old outlet. (doc.govt.nz)
[2] [3] Tephra from the eruption covered much of the central North Island with ignimbrite up to 200 metres (650 feet) deep, and most of New Zealand was affected by ash fall , with even an 18 cm (7 inch) ash layer left on the Chatham Islands , 1,000 km (620 mi) away. (wikipedia.org)
Mount Tarawera 's eruption around 1310 CE, while not nearly as large, was still substantial, producing 2.5 km³ of lava and 5 km³ of tephra (VEI 5). (wikipedia.org)

The explosivity of an eruption usually results from gases expanding within a viscous lava or from water entering a magma chamber or channel. (besafenet.net)
A new landmass formed in 2009 as an explosive eruption sent steam , gases and ash roughly 800 meters (2,625 feet) into the sky. (nationalgeographic.org)
A modern recurrence of an extraordinary type of volcanic eruption in Iceland could inject large quantities of hazardous gases into North Atlantic and European flight corridors, potentially for months at a time, a new study suggests. (agu.org)
At the same time, explosive interactions of the magma with older coal deposits could have released large amounts of carbon dioxide and methane, two greenhouse gases, which would explain the intense global warming recorded in the oceans and on land at the time of the mass extinctions. (wattsupwiththat.com)
For the last 2,000 years, the dominant forcings have been the natural changes in solar irradiance and volcanic eruptions, along with the more recent anthropogenic influences from greenhouse gases, tropospheric aerosols, and land use changes. (nationalacademies.org)
Volcanic eruptions, changes in the Sun's radiative output, and the mostly anthropogenic changes in greenhouse gases, tropospheric aerosols, and land use are the main climate forcings for surface temperatures over the last 2,000 years. (nationalacademies.org)
Explosive eruptions occur when gases dissolved in molten rock (magma) expand and escape violently into the air, and also when water is heated by magma and abruptly flashes into steam. (helpsleddogs.org)
Yellowstone's plume of ash, lava, and volcanic gases would reach a height of fifteen miles or more , and from this lofty position, be blown across North America. (geoscience.blog)

This cataclysmic eruption , which occurred on May 18, 1980, is the most significant volcanic eruption in the contiguous U.S. in recent history. (yahoo.com)
But on May 10th, 1980, Jess finds herself in the middle of the deadliest volcanic eruption in U.S. history. (toymastersmb.ca)
Explosive volcanism is often a violent event that results in large ash and debris eruptions, such as the Mount Saint Helens eruption in 1980. (spaceanswers.com)
It is believed that the eruption column was 50 kilometres (31 mi) high, twice as high as the eruption column from Mount St. Helens in 1980. (wikipedia.org)
In spring of 1980, a series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 a.m. (wa.gov)

Taupō's most recent major eruption , the Taupō or Hatepe eruption , took place around 232 CE, and is New Zealand's largest eruption since Oruanui. (wikipedia.org)
Mount Agung could produce a major eruption at any moment, officials have warned. (hurriyetdailynews.com)

These earthquakes are associated with volcanic activity and occur as magma rises to the surface. (tagvault.org)
Eruptions occur when magma builds up in these chambers and reaches the top. (yahoo.com)
Generally speaking, as a volcanic eruption approaches, scientists have a better chance of being able to predict when it'll occur. (yahoo.com)
While scientists have known for some time that Mars has some volatiles - i.e. water, carbon dioxide and other elements that become gas with slight increases in temperature - in its crust that allow for periodic explosive eruptions to occur on the surface, the kind of eruption needed to create the Medusa Fossae region would have been immense. (universetoday.com)
We expect additional shallow seismicity and other signs of unrest, such as gas emissions, elevated surface temperatures, and ground movement, to precede any future eruption if one were to occur. (alaska.edu)

Prior to 2018, the previous known eruption of Semisopochnoi occurred in 1987, probably from Sugarloaf Peak on the south coast of the island, but details are lacking. (alaska.edu)
Its Oruanui eruption was the world's largest known eruption in the past 70,000 years, with a Volcanic Explosivity Index (VEI) of 8. (wikipedia.org)

A conical hill, often steep, formed by accumulation of solidified fragments of lava that fall around the vent of a single basaltic or andesitic eruption. (usgs.gov)

We work with national and international government agencies on innovative research and to provide support and scientific advice not only during volcanic unrest, but also in preparation for potential future unrest and eruptions. (bgs.ac.uk)
While the network has not been fully restored the additional information will aid in the detection of changes in unrest that may lead to a more significant explosive eruption. (alaska.edu)

In the event of an eruption in Iceland volcanic emissions may affect the UK. (bgs.ac.uk)
An infrasound array on Adak Island could detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit. (alaska.edu)
Ash and volcanic gas emissions continued intermittently throughout the week and were visible at times in web camera and satellite data. (alaska.edu)

Massive volcanic eruptions that spew sulfur-rich particles into the atmosphere can disrupt climate around the globe, leading to cooler temperatures worldwide. (agu.org)
Volcanic ash in the atmosphere is a hazard particularly for civil aviation. (bgs.ac.uk)
More than likely it was SO2 and other aromatic areosols also ejected into the atmosphere during the eruptions causing dramatic cooling that lead to the extinction. (wattsupwiththat.com)

Inhaling volcanic ash particles can cause breathing problems, particularly for children, the elderly and those with chronic respiratory issues. (americares.org)
Because volcanic ash particles have a low melting point, it can melt in the combustion chamber of a jet engine, creating a ceramic or glass-like glaze that then sticks to turbine blades, fuel nozzles, and combustors. (weatherboy.com)

Considering we've never seen a kimberlite eruption, we have to try to back out the events that happen and the timing of the eruption using clues in the rocks---like how minerals shatter, the types of material found in the deposits, and the shapes of the pipes. (discovermagazine.com)
However, most of the formulations developed thus far are designed to capture the effects of moraine debris deposits which are usually formed by layers with thicknesses on the order of meters or at least decimeters or centimeters. (copernicus.org)
These eruptions, the researchers say, are associated with nickel-rich magmatic intrusions - rocks formed from the cooling of magma - that contain some of the greatest deposits of nickel ore on the planet. (wattsupwiththat.com)
Determining the ages of effusive volcanic deposits can give researchers a handle on a planet's geological history. (spaceanswers.com)
Because there are no physical samples from the planet that could be used for radiometric dating, the researchers used crater size-frequency analysis, in which the number and size of craters on the planet's surface are placed into established mathematical models, to calculate absolute ages for effusive volcanic deposits on Mercury. (spaceanswers.com)
When it comes to the Medusae Fossae Formation, scientists were unsure whether wind, water, ice or volcanic eruptions were responsible for the deposits. (universetoday.com)
Marking its centennial, we illustrate and document the complex eruptive sequence, which was long misattributed to nearby Mount Katmai, and how its deposits have provided key insights about volcanic and magmatic processes. (usgs.gov)
Fieldwork at Katmai was not resumed until 1953, but, since then, global advances in physical volcanology and chemical petrology have gone hand in hand with studies of the 1912 deposits, clarifying the sequence of events and processes and turning the eruption into one of the best studied in the world. (usgs.gov)

Scientists are still developing ways to better predict volcanic eruptions. (yahoo.com)
Atmospheric dispersion models are used to predict volcanic ash transport. (bgs.ac.uk)

In 1969,1971, 1975, and 1977 eruptions of Ruapehu generated ash and lahars that damaged the skifields. (doc.govt.nz)

The Yellowstone supervolcano - an 8 out of 8 on the Volcanic Explosivity Index - has erupted three times over the past 2.1 million years, most recently 640,000 years ago. (geoscience.blog)

Made of alternating layers of lava and volcanic debris, it's in the same geological family as Mount Saint Helens and other peaks in the Cascade Range. (lclark.edu)

This makes it one of the most violent eruptions in the last 5000 years (alongside the Tianchi eruption of Baekdu at around 1000 and the 1815 eruption of Tambora ). (wikipedia.org)

Eruptions readers were quick on the news about the new eruption at Sinabung in Indonesia. (scienceblogs.com)
A 2014 eruption at Sinabung killed 16. (hurriyetdailynews.com)

they represent one of the most devastating hazards for people living in volcanic areas (Pierson et al. (copernicus.org)
Our scientists draw on a broad range of expertise across the BGS and from collaborative research worldwide to improve understanding of volcanic processes, hazards and risks. (bgs.ac.uk)

In addition, HVO has cautioned about the possibility of an explosive eruption at Halema'uma'u Crater due to the withdrawal of lava from Kilauea summit lake. (hawaii247.com)
This could generate dangerous debris very near the crater and ashfalls up to tens of miles downwind. (hawaii247.com)
The eruption tossed large volcanic cinders (pieces of hot lava) more than 5,900 feet (1,800 meters) from the volcano's Showa crater, one of two active craters atop Sakurajima. (livescience.com)
Recent eruptions have modified the morphology of the summit crater. (si.edu)
Mt Tongariro's active Red Crater last emitted ash in 1926, and there were eruptions from the Te Maari craters on Mt Tongariro's northern slopes on 6 August 2012 and 21 November 2012. (doc.govt.nz)
Volcanic activity continues, with periodic eruptions beneath Crater Lake. (doc.govt.nz)
More than 60 eruptions from Ruapehu's crater have been recorded since 1945. (doc.govt.nz)
The bright, circular deposit in the upper centre of this enhanced colour image of Mercury is an enormous effusive volcanic deposit, situated within the largest impact crater on the planet, the Caloris Basin. (spaceanswers.com)
CRATER : The depression found at the top of most volcanic cones is called a __________. cone PLATEAU : A large area of flat, elevated land. (crosswordspin.com)
Slow eruption of lava in the summit crater likely continues. (alaska.edu)

Stamford, Conn. - Jan. 1 4, 2020 - Americares has deployed an emergency response team to assist families displaced by the volcanic activity in the Philippines. (americares.org)
This year we haven't had a lot of news about volcanic activity in Indonesia. (scienceblogs.com)
After a 26 year repose without signs of unusual activity, Reventador burst unexpectedly into a VEI 4 eruption on 3 November 2002. (si.edu)
Researchers suspect the volcano's long string of activity is due to a steady stream of magma feeding its volcanic vents, like a constantly running underground pipe. (livescience.com)
The region around Naples is an area of highly volcanic activity, beside Vesuvius there are the Phlegraean Fields, a large volcanic area situated to the west of Naples. (nationsonline.org)
Pressure waves from explosive activity were detected on local seismic stations and in regional infrasound data at times this past week, and reached a high level of on March 23. (alaska.edu)
The region of volcanic activity that occurs from Mt Ruapehu to White Island in the Bay of Plenty is known collectively as the Taupō Volcanic Zone. (doc.govt.nz)
Volcanic activity in the zone started about 2 million years ago and continues today. (doc.govt.nz)
New research from North Carolina State University finds that major volcanic activity on the planet Mercury most likely ended about 3.5 billion years ago. (spaceanswers.com)
There are two types of volcanic activity: effusive and explosive. (spaceanswers.com)
Until now, the duration of effusive volcanic activity on Mercury, made of the same materials as these other planets, had not been known. (spaceanswers.com)
While the land's volcanism dates back to before the Zealandia microcontinent rifted away from Gondwana 60-130 million years ago, activity continues today with minor eruptions occurring every few years. (wikipedia.org)
Map of selected surface volcanic features in the northern North Island which includes features from volcanic activity in recorded historic times in New Zealand . (wikipedia.org)
Experts said Agung's recent activity matches the build-up to the earlier disaster, which ejected enough debris -- about a billion tonnes -- to lower global average temperatures by around 0.3 degrees Celsius for roughly a year. (hurriyetdailynews.com)
According to a new study from Johns Hopkins University, the region was the result of volcanic activity that took place on the Red Planet more than 3 billion years ago. (universetoday.com)
Even after a series of ash-producing eruptions has ended, wind and human activity can stir up fallen ash for months or years, presenting a long-term health and economic hazard. (helpsleddogs.org)

An advisory from the Washington VAAC shows an area of hazardous volcanic ash traveling east over the central Atlantic from an earlier explosive eruption. (weatherboy.com)
Pyroclastic density currents (PDCs) are perhaps the most hazardous events to local areas during explosive volcanic eruptions. (bgs.ac.uk)

New Zealand's rocks record examples of almost every kind of volcanism observed on Earth, including some of the world's largest eruptions in geologically recent times. (wikipedia.org)
Indonesia, the world's most active volcanic region, lies on the Pacific "Ring of Fire" where tectonic plates collide, causing frequent volcanic and seismic activities. (hurriyetdailynews.com)

Source: "The Eruption of Vesuvius as seen from Naples, October 1822" from V. Day & Son. (besafenet.net)
Mount Vesuvius had what is probably the most infamous volcanic eruption on August 24, 79 AD. (ancient-origins.net)
Prior to the eruption of 79 AD, Mount Vesuvius had a long historic and mythical tradition. (ancient-origins.net)
Here's an overview of how volcanic eruptions happen, a look back at Mount Vesuvius and an update on Yellowstone Caldera. (yahoo.com)
Ruins of Pompeii, the ancient Roman city and many villas in the area were mostly destroyed and buried under 4 to 6 m of ash and pumice (a volcanic rock) in the eruption of Mount Vesuvius in 79 AD. (nationsonline.org)
If, or better when, Vesuvius will erupt again, and if the eruption points in the wrong direction, the destructive pyroclastic flow of hot gas and rock with the speed of 600 km/h sweeping along close to the ground, will reach sprawling Naples within seconds. (nationsonline.org)

Traditionally Ngauruhoe has erupted at least every nine years, although at the time of writing the last eruption was in 1975. (doc.govt.nz)

77 cubic mi) and most active volcanic centers in the Aleutian Arc and has erupted at least 14 times in the past 200 years. (alaska.edu)

The following tentative chronology of the eruption is based upon IG seismic and NOAA data, as well as eyewitness accounts and photos. (si.edu)
Table 1 summarizes seismic, visual, and satellite observations of the initial eruptions on 3 November that led to the main eruption's starting at 0912. (si.edu)
Correlation of ~50 earthquakes recorded at distant seismic stations (including 14 shocks of magnitude 6.0 to 7.0) to fitful caldera collapse provides further constraints on eruption timing, because layers of nonjuvenile breccia and mud ejected from Mount Katmai during collapse pulses are intercalated with the pumice-fall layers from Novarupta. (usgs.gov)

The United States, in partnership with the International Civil Aviation Organization (ICAO), operates two Volcanic Ash Advisory Centers (VAACs) within the National Oceanic and Atmospheric Administration (NOAA. (weatherboy.com)

We are part of a Memorandum of Understanding with the Icelandic Meteorological Office , the UK Met Office and the National Centre for Atmospheric Science in order to enhance scientific collaboration before during and after eruptions. (bgs.ac.uk)

A ring-shaped cloud of gas and suspended solid debris that moves radially outward at high velocity from the base of a vertical eruption column. (usgs.gov)

Recent eruptions in 1993-95, 2005, 2013, and 2018 all occurred at the intracaldera cone and lasted for several months. (alaska.edu)

The Philippine Institute of Volcanology and Seismology raised the alert to a Level 4, indicating an imminent explosive eruption and ordered a total evacuation within 14 kilometers of the volcano's danger zone-a process made difficult by the poor visibility and, for many, a lack of transportation. (americares.org)
Not much out there on the details of the eruption beyond this intriguing statement: Diego Gomez from the Pasto Observatory of Vulcanology and Seismology said that due to the atypical, non-explosive eruption, another eruption is imminent. (scienceblogs.com)

It was one of the few historical eruptions to produce a collapsed caldera, voluminous high-silica rhyolite, wide compositional zonation (51-78 percent SiO 2 ), banded pumice, welded tuff, and an aerosol/dust veil that depressed global temperature measurably. (usgs.gov)

NOAA GOES images first show eruption cloud. (si.edu)
GOES images show eruption cloud beginning to travel to SW. (si.edu)

The U.S. Department of Agriculture said, "After the eruption, the summit of Mount St. Helens was gone, forests were obliterated and rivers followed new courses. (yahoo.com)
Eruption of lava from a sub-glacial flank vent near the summit cone likely continues, as indicated by incandescence in web camera and satellite data, as well as highly elevated surface temperatures observed in satellite data. (alaska.edu)
The volcanic plume appears pale blue-gray, distinct near the summit, and growing more diffuse to the south. (nasa.gov)

And if that isn't enough to capture your attention, it has been revealed that Yellowstone's underground volcanic plumbing is much bigger and better connected than scientists previously thought. (modernsurvivalblog.com)
Scientists are working to understand how explosive volcanic eruptions - and potential geoengineering efforts - would affect rain worldwide. (agu.org)
BGS scientists respond to volcanic eruptions and contribute to the Scientific Advisory Group in Emergencies (SAGE). (bgs.ac.uk)
Our scientists also respond to eruptions worldwide as appropriate, providing advice or a collaborative scientific response. (bgs.ac.uk)
A team of scientists has found new evidence that the Great Permian Extinction, which occurred approximately 250 million years ago, was caused by massive volcanic eruptions that led to significant environmental changes. (wattsupwiththat.com)
This new evidence of a nickel fingerprint at the time of the extinctions convinced the scientists that it was the volcanic upheaval in Siberia that produced intense global warming and other environmental changes that led to the disappearance of more than 90 percent of all species. (wattsupwiththat.com)

The scalloped bays indenting Lake Taupō 's northern and western coasts are typical of large volcanic caldera margins. (wikipedia.org)
The caldera they surround was formed during the huge Oruanui eruption . (wikipedia.org)
[4] New Zealand's largest lake, Lake Taupō , fills the caldera formed in this eruption. (wikipedia.org)
Syneruptive collapse of a kilometer-deep caldera took place atop Mount Katmai, a stratovolcano centered 10 km east of the eruption site at Novarupta, owing to drainage of magma from beneath the Katmai edifice. (usgs.gov)

Yet, unlike many geologic processes, a kimberlite eruption could launch rocks from the mantle at over 250 kilometers an hour! (discovermagazine.com)

Volcanic eruptions conjure up images of huge fiery explosions, searing hot magma and charred, decimated landscapes. (agu.org)
Researchers can track the impacts by looking at ice cores or tree rings that record summer growth, but a different approach involves scouring through historical records to see what kind of an impact these volcanic explosions had on everyday life. (agu.org)

The U.S. Department of the Interior said, "The explosivity of an eruption depends on the composition of the magma. (yahoo.com)

New Zealand has been the site of many large explosive eruptions during the last two million years, including several of supervolcano size. (wikipedia.org)
The monograph concludes by comparing the 1912 eruption with several other well-studied large explosive eruptions, 14 of them historical and 9 prehistoric. (usgs.gov)
The answer is- NO, a large explosive eruption at Yellowstone will not lead to the end of the human race . (geoscience.blog)

From this, they concluded that the heavily-porous rock had to have been deposited by volcanic eruptions when Mars was still geologically active - ca. 3 billion years ago. (universetoday.com)

The famous "year without a summer" in 1816, during which Mary Shelley was forced to stay indoors to write Frankenstein, followed the great Tambora eruption. (wikipedia.org)

He was an Associate Research Scientist at the NASA, Goddard Institute for 5 years, studying the effects of volcanic eruptions on climate, before taking up his present position at NYU. (wikipedia.org)
Early work centered on multi-year climate cooling after explosive volcanic eruptions, the post-glacial rise in sea level over the last 10,000 years, and glacial/interglacial climate and sea level over the last 150,000 years. (wikipedia.org)
Yellowstone eruption history: 2.1 million, 1.3 million, 0.64 million years ago. (modernsurvivalblog.com)
In recent years there have been numerous studies dealing with the relationship between debris thickness and resulting modification of ablation (e.g. (copernicus.org)
what is a volcanic eruption that has occurred in the past 20 years? (tempcloudsite.com)
A preliminary evaluation implies that this was one of Ecuador's most powerful eruptions of the past 100 years. (si.edu)
The earliest eruptions of Mt Ngauruhoe are thought to have occurred 2500 years ago. (doc.govt.nz)
According to their results, major volcanism on Mercury stopped at around 3.5 billion years ago, in stark contrast to the volcanic ages found for Venus, Mars and Earth. (spaceanswers.com)
Climate model simulations indicate that solar and volcanic forcings together could have produced periods of relative warmth and cold during the preindustrial portion of the last 1,000 years. (nationalacademies.org)

BGS Volcanology researchers are improving knowledge and understanding of eruption processes through research and the development of novel computational tools. (bgs.ac.uk)
Small eruptions have been happening continuously but there's still the possibility of a bigger, explosive eruption," said I Gede Suantika, a senior volcanologist at Indonesia's volcanology agency. (hurriyetdailynews.com)

However, on Saturday the mountain sent smoke up into the air for the second time in a week in what volcanologists call a phreatic eruption -- caused by the heating and expansion of groundwater. (hurriyetdailynews.com)

Today was a doubleheader for volcanic eruptions in the news: Today's explosive eruption from Mt. Etna. (scienceblogs.com)

The explosive outburst at Novarupta (Alaska) in June 1912 was the 20th century's most voluminous volcanic eruption. (usgs.gov)

Each explosive eruption event is sending a massive plume of ash and rock high into the sky, blanketing everything with volcanic debris. (weatherboy.com)
intervals (50:50 sandstone vs. siltstone, +/- ironstone concre-tions), siltstones contain abun-dant plant debris, sandstones (both massive and thin interbeds)Consist of fragments (clasts) of pre-existing rocks, which have been transported and deposited by physical processes (e.g. sandstone, mudstone). (antep-grill.de)

When they erupt, they produce piles of broken volcanic debris (pyroclastic material) and the cone is filled with kimberlite breccia made from magma, xenoliths, and anything else in the way. (discovermagazine.com)
A photo showing the young intracaldera cone and main eruption column (on right) of Reventador at 0912 (local time) on 3 November 2002. (si.edu)

The Yellowstone region is monitored by the University of Utah which records and processes data from a network of 71 GPS stations in the Yellowstone volcanic field. (modernsurvivalblog.com)

A Plinian eruption seen from space. (nationsonline.org)

Diseases1

Chemicals and Drugs2

Phenomena and Processes2

Health Care2

Volcanoes18

Volcano37

Flows18

20212

Earth's4

Tephra8

Gases8

19805

Major eruption2

Occur5

Known eruption2

Basaltic1

Unrest2

Emissions3

Atmosphere3

Particles2

Deposits8

Predict volcanic2

Lahars1

Explosivity Index1

Layers of lava1

1815 eruption1

Sinabung2

Hazards2

Crater10

Activity16

Hazardous2

World's2

Vesuvius6

Last eruption1

Active volcanic1

Seismic3

Centers1

Centre1

Suspended solid debris1

20181

Imminent2

Tuff1

Cloud2

Summit3

Scientists6

Caldera4

Geologic1

Explosions2

Department of the I1

Large3

Geologically1

Tambora1

Years9

Volcanology2

Phreatic1

Etna1

19121

Massive2

Cone2

Processes1

Plinian1