• That eruption, similar to the 1980 event at Mount St. Helens, produced a large horseshoe-shaped crater that was formed by collapse of the summit and an associated lateral blast. (scienceblogs.com)
  • The eruption following the slide eviscerated the mountain, leaving a crater 2000 feet deep. (grisda.org)
  • The vertical eruption lowered the south wall of the mountain and, along with the collapse of the north flank, produced a huge crater with the rim approximately a mile in diameter and at least 2 miles long. (grisda.org)
  • Some of these non-eruptive anomalies can be explained by aftershocks of regional seismic events, magmatic activity that did not lead to eruption, or unrest at other nearby volcanoes. (frontiersin.org)
  • Sally Sennert from the Smithsonian Institution sent me an email to say that this week's USGS/Smithsonian Institute Weekly Volcanic Report will be delayed due to the inclement weather in the Washington DC area. (scienceblogs.com)
  • PLEASE NOTE: Website posting of the SI/USGS Weekly Volcanic Activity Report for 3-9 February 2010 will be delayed due to closings from inclement weather. (scienceblogs.com)
  • Recent explosions have been steam-driven, occurring when water beneath the ground or on the surface is heated by magma, lava, hot rocks or new volcanic deposits, the USGS says. (clickondetroit.com)
  • The result of this directed blast (lateral rather unusual in volcanic eruptions) was the devastation of many square miles of terrain in a 160 arc to the north. (grisda.org)
  • The high velocity wind (initially close to 200 miles per hour) (9) produced by the collapse of the mountain was immediately followed by the lateral volcanic eruption. (grisda.org)
  • However, many eruptions occur without such precursors. (frontiersin.org)
  • Additionally, identifying seismic rate increases near volcanoes with high levels of background seismicity is non-trivial and many periods of elevated seismicity occur without ensuing eruptions, limiting their usefulness for forecasting in some cases. (frontiersin.org)
  • We also explore the rate of other anomalies not precursory to eruptions and investigate their origins. (frontiersin.org)
  • Volcanic eruptions are often accompanied by spatiotemporal migration of ground deformation, a consequence of pressure changes within magma reservoirs and pathways. (wiley.com)
  • Earthquake swarms are common occurrences at volcanoes worldwide and are often associated with periods of increased volcanic unrest. (frontiersin.org)
  • After the initial northward blast the eruption changed into a vertical phase, and continued so for several hours. (grisda.org)
  • Janez Potocnik, the European Science and Research Commissioner, will be in Cape Town on 29 and 30 November, representing the European Commission at the Global Earth Observation (GEO) Summit. (innovations-report.com)
  • This Summit will review progress on the implementation of the 10-year plan to create a Global Earth Observation System of Systems (GEOSS), agreed at the GEO summit held in Brussels in February 2005. (innovations-report.com)
  • More than 70 national governments and 50 international organisations are taking part in the Global Earth Observation Summit in Cape Town, to review progress and agree on future developments of GEOSS. (innovations-report.com)
  • It would be difficult for some political leaders to go home and explain to their citizens that all that had been accomplished at the Summit was the avoidance of a major pullback from the 20‑year‑old commitments of the United Nations Conference on Environment and Development (or "Earth Summit"), also held in Rio de Janeiro. (un.org)
  • Few geologic events in recent times have attracted more attention than the eruption of Mount St. Helens. (grisda.org)
  • To determine how variations in temperature and chemical characteristics of subseafloor fluids affect the microbial communities, we performed molecular phylogenetic and chemical analyses on diffuse-flow vent fluids from one site shortly after a volcanic eruption in 1998 and again in 1999 and 2000. (asm.org)
  • The figure shows that the volcanic signal is very small - only 1 percent above the background atmospheric carbon. (wattsupwiththat.com)
  • In this study, we consistently apply a common statistical tool, the β-statistic, to seismically monitored eruptions in Alaska of various styles to determine the overall prevalence of seismic rate anomalies immediately preceding eruptions. (frontiersin.org)
  • Overall, our results confirm that seismic rate increases are common prior to larger eruptions at long dormant, "closed-system" volcanoes, but uncommon preceding smaller eruptions at more frequently active, "open-system" volcanoes with more mafic magmas. (frontiersin.org)
  • Similar patterns of deflation and inflation were recorded at K̄lauea's summit, approximately 15 km to the northwest, albeit with time delays of hours. (wiley.com)
  • The eruption that removed over 1300 feet from the top of the beautiful mountain was triggered or preceded by a 4.9 magnitude earthquake (4). (grisda.org)
  • The eruption of Mount St. Helens at 8:32 Sunday morning, May 18, was observed by several people both from the air and from adjacent campsites or logging areas (7). (grisda.org)