Largely unknown mechanisms restrain motion of clay-rich, slow-moving landslides that are widespread worldwide and rarely accelerate catastrophically. We studied a clayey, slow-moving landslide typical of thousands in northern California, USA, to decipher hydrologic-mechanical interactions that modulate landslide dynamics. Similar to some other studies, observed pore-water pressures correlated poorly with landslide reactivation and speed. In situ and laboratory measurements strongly suggested that variable pressure along the landslides lateral shear boundaries resulting from seasonal soil expansion and contraction modulated its reactivation and speed. Slope-stability modeling suggested that the landslides observed behavior could be predicted by including transient swell pressure as a resistance term, whereas modeling considering only transient hydrologic conditions predicted movement 5-6 months prior to when it was observed. All clayey soils swell to some degree; hence, our findings suggest that swell

We have all been dismayed to see the extent of the damage done during the recent landslides that occurred after forest fires had destroyed much of the vegetation, and then intense rain caused a horrific landslide to occur in Montecito. You can read more here about how NASAs Operational Land Imager (OLI) on Landsat 8 was able to acquire natural color imagery of the affected region both before and after the landslide occurred, which enables us to observe the impact of this natural disaster on the environment. NASAs Global Precipitation Measurement mission (GPM) measured the intense rainfall that caused this landslide to occur in the region that had already experienced wild fires the month before. You can learn more about how GPM measured this storm here. Join us for our ENSO Phase III Water in Our Environment webinar on Thurs., Feb. 8th at 8 pm (EST) as we learn about how and why NASA satellites study landslides from Dr. Dalia Kirschbaum. We will also hear from some GLOBE teachers and students ...

Preparation of reliable landslide hazard and risk maps is crucial for hazard mitigation and risk management. In recent years, various approaches have been developed for quantitative assessment of landslide hazard and risk. However, possibly due to the lack of new data, very few of these hazard and risk maps were updated after their first generation. In this study, aiming at an ongoing assessment, a novel approach for updating landslide hazard and risk maps based on Persistent Scatterer Interferometry (PSI) is introduced. The study was performed in the Arno River basin (central Italy) where most mass movements are slow-moving landslides which are properly within the detection precision of PSI point targets. In the Arno River basin, the preliminary hazard and risk assessment was performed by Catani et al. (Landslides 2:329-342, 2005) using datasets prior to 2002. In this study, the previous hazard and risk maps were updated using PSI point targets processed from 4 years (2003-2006) of RADARSAT ...

Abdulwahid, W. M., and Pradhan, B.: Landslide vulnerability and risk assessment for multi-hazard scenarios using airborne laser scanning data (LiDAR), Landslides, 14, 1057-1076, https://doi.org/10.1007/s10346-016-0744-0, 2016. Ayalew, L., Yamagishi, H., and Ugawa, N.: Landslide susceptibility mapping using GIS-based weighted linear combination, the case in Tsugawa area of Agano River, Niigata Prefecture, Japan, Landslides, 1, 73-81, https://doi.org/10.1007/s10346-003-0006-9, 2004. Chen, H. X., Zhang, S., Peng, M., and Zhang, L. M.: A physically-based multi-hazard risk assessment platform for regional rainfall-induced slope failures and debris flows, Eng. Geol., 203, 15-29, https://doi.org/10.1016/j.enggeo.2015.12.009, 2016. Chen, L., Yin, K. L., and Dai, Y. X.: Building vulnerability evaluation in landslide deformation phase, J. Mount. Sci., 8, 286-295, https://doi.org/10.1007/s11629-011-2101-z, 2011. Chen, L., van Westen, C. J., Hussin, H., Ciurean, R. L., Turkington, T., Chavarro-Rincon, D., ...

The paper gives a review of conditions and triggers in which landslides occur on flysch slopes in central and northern Istria. The north-eastern part of the Istrian Peninsula, the so-called Gray Istria, consists of Paleogene flysch rock mass. Landslides in this area are usually triggered by heavy rainfall together with human activity which changes slope geometry and assists in retaining surface water in the sliding zone. Briefly, hydrogeological conditions in combination with ground water levels and pore water pressures increase, lead to numerous instability phenomena, during the long and continuous rainfall periods. Instabilities usually include small rotational and translational landslides, and it is seldom that debris flows and rock falls occur. Landslides are evenly evidenced in the first part of winter and the early spring time which corresponds to the second rainfall peak. The analyses performed based on landslide documentation and rainfall historical data, show rainfall trends associated ...

Abstract. In the paper we analyse a multi-date landslide inventory prepared for a mountainous area affected by several landslide types with different degrees of activity, we attempt to quantify the uncertainties associated to the mapping, we measure the evolution of morphological indicators and estimate landslide activity and temporal occurrence. The inventory, covering the period 1956-2010, is prepared for the middle section of the Ubaye valley (southern French Alps) based on the analysis of multi-source documents (geomorphological maps, historical reports of landslide events, field surveys, orthophotographs and SAR (synthetic aperture radar) satellite images). The uncertainties derived from the expert interpretation of different sources of information, the landslide morphological features and the affected land covers are taken into account in relation to the source documents ...

In this study, Random SubSpace-based classification and regression tree (RSCART) was introduced for landslide susceptibility modeling, and CART model and logistic regression (LR) model were used as benchmark models. 263 landslide locations in the study area were randomly divided into two parts (70/30) for training and validation of models. 14 landslide influencing factors were selected, such as slope angle, elevation, aspect, sediment transport index (STI), topographical wetness index (TWI), stream power index (SPI), profile curvature, plan curvature, distance to rivers, distance to road, soil, normalized difference vegetation index (NDVI), land use, and lithology. Finally, the hybrid RSCART model and two benchmark models were applied for landslide susceptibility modeling and the receiver operating characteristic curve method is used to evaluate the performance of the model. The susceptibility is quantitatively compared based on each pixel to reveal the system spatial pattern between susceptibility maps

Incessant rain over the last few days has thrown life out of gear in Mumbai and several other parts of Maharashtra.. Over 50 people died in different landslides and wall collapse incidents.. The biggest tragedy happened in Raigad district where several houses were destroyed due to landslides and killed over 30 people.. Another massive landslide was reported from Raigad districts Poladpur on Thursday.. Over 10 houses were damaged while few others washed away.. Several houses were also damaged after landslides triggered by heavy rains in Ambenagar and Mirgaon in Satara district.. Loss of life was also reported after a building collapsed in Govandi area of ​​Mumbai.. Apart from this, Several low lying areas of Kher and Posare have been submerged. Locals are facing major difficulties due to disrupted power supply.. Two Indian Air Force helicopters Mi-17V5s and Mi-17 have been called in for rescue operations to evacuate stranded in Ratnagiris Chiplun and Khed areas.. NDRF along with several ...

The bodies of the deceased were recovered this morning and are being handed over to their families after completion of legal formalities, the official said.. In another incident, the official said 40-year-old Wali Mohammad was killed in a landslide in Khandi Gali Dhok on Monday.. The deceased was grazing his cattle when the landslide occurred, he said, adding five buffaloes were also killed in the incident.. Meanwhile, traffic on the Jammu-Srinagar national highway was suspended early Tuesday after heavy rains triggered a massive landslide in Ramban district, blocking the arterial road, officials said.. Deputy Superintendent of Police, Traffic (National Highway), Ajay Anand said the landslide struck the highway at Dalwas around 5 am, also damaging a portion of the road.. The agencies concerned have started the road clearance operation to restore the highway, he said adding the restoration work would take time given the damage to the road.. Traffic was stopped at Qazigund in south Kashmir ...

Computer-assisted three-dimensional (3D) mapping using stereo and multi-image (softcopy) photogrammetry is shown to enhance the visual interpretation of geomorphology in steep terrain with the direct benefit of greater locational accuracy than traditional manual mapping. This would benefit multi-parameter correlations between terrain attributes and landslide distribution in both direct and indirect forms of landslide hazard assessment. Case studies involve synthetic models of a landslide, and field studies of a rock slope and steep undeveloped hillsides with both recently formed and partly degraded, old landslide scars. Diagnostic 3D morphology was generated semi-automatically both using a terrain-following cursor under stereo-viewing and from high resolution digital elevation models created using area-based image correlation, further processed with curvature algorithms. Laboratory-based studies quantify limitations of area-based image correlation for measurement of 3D points on planar ...

The anticipated arrival of computer technology in the processing of image is exercised in numerous domain areas. The image processing serves as an emergence for the mechanism of partitioning the images known as image segmentation. This mechanism of partitioning the images into number of segments helps in extracting the information from distinct parts. The image segmentation process aids in the detection of landslide information. The remote sensing images known as aerial photos, captured through satellites are used as the initial image for estimating the landslide affected regions. The landslide also termed as landslip creates the destruction in human life including loss of life and property, disturbances raised by communication channels and transportation sectors and damage in vegetation region. This is estimated as a serious hazard and thereby should be anticipated in advance. This paper presents a comparative approach on algorithm and techniques for perceiving the landslide detection using ...

To help reduce the impact of geohazards, an innovative landslide early-warning technology based on an energy demodulation-based fiber optic sensing (FOS-LW for short) technology, is introduced in this paper. FOS-LW measures the energy change in a sensing fiber at the segment of micro-bending, which can be caused by landslide movements, and automatically raises an alarm as soon as the measured signal intensity in the fiber reaches a pre-set threshold. Based on the sensing of micro-bending losses in the fiber optics, a two-event sensing algorithm has been developed for the landslide early-warning. The feasibility of the FOS-LW technology is verified through laboratory simulation and field tests. The result shows that FOS-LW has some unique features such as the graded alarm, real-time responses, remote monitoring, low cost and passive optical network, and can be applied in the early-warning of landslides.

Natural hazards comport all injurious geophysical events, such as earthquakes, flooding and landsliding [1, 2, 3, 4, 5, 6, 7, 8].. Landslides occur worldwide; however, their frequency/ intensity is greater in countries with mountainous and hilly environments [9, 10]. Only for earthquakes and movements of land, the NE of Algeria is yearly affected by loss of property greater than that caused by any other problem, especially in the Constantine province, where recurrent slope failures caused severe damages [11, 12]. To the east of the chief town, the A1 highway and its neighbouring have been affected by spectacular mass movements during and after its construction [13].. Landslide susceptibility assessment has become a major research topic in the last few decades [14]. It is often performed through the identification, analysis and combination of landslide causative factors. It is generally approached by two broad techniques: (i) qualitative approaches, based on expert knowledge, and (ii) ...

Landslide precipitation thresholds as a first step towards robust landslide early warning systems in Rwanda https://link.springer.com/article/10.1007

When a deadly landslide killed nearly 100 people and forced the evacuation of 75,000 in Guatemala on May 30, NASA carefully documented it. And when more than 300 other rain-triggered landslides pulled the Earth out from beneath towns and villages in China, Uganda, Bangladesh, Pakistan and other countries in 2010, NASA researched and documented each one. Sudden, rain-induced landslides kill thousands each year, yet no one organization had consistently catalogued them to evaluate historical trends, according to landslide expert Dalia Kirschbaum of NASAs Goddard Space Flight Center. Three years ago, Kirschbaum set out to change that by creating a searchable inventory of landslides specifically triggered by rain.. WhatOnEarth spoke with Kirschbaum to understand how this tool might tell us more about when and where landslides are most likely to occur.. WhatOnEarth: What is a landslide?. Kirschbaum: Landslides occur when an environmental trigger like an extreme rain event - often a severe storm or ...

At least 15 people were killed in landslides in north-eastern Nepal, police said Thursday, according to dpa.Landslides hit at least six villages in the district of Taplejungafter heavy rain fell Wednesday on ground destabilized by earthquakesin April and May.At least a dozen houses were also washed out by the landslides, andp

The purpose of this study was to reconstruct spatiotemporal patterns of past landslide reactivation in a forested area of the Barcelonnette Basin (Bois Noir landslide, Southern French Alps). Analysis

Find all tickets for all Landslide upcoming shows. Discover Landslide concert details and information. Explore Landslide photos, videos, and more from past shows.

Find many great new & used options and get the best deals for Landslides/Landslide Mitigation Reviews in Engineering Arthur Keen Geology 1993 at the best online prices at eBay! Free shipping for many products!

Construction or maintenance personnel and a geotechnical engineer narrowly avoided being a victim of a new landslide at the site of a landslide cleanup. They were attempting to clean up a landslide on the State Highway 2 in the Waioeka Gorge, New Zealand when spotters noticed the area becoming unstable. The workers were pulled back and had to run for it, but one worker was swept away by the slide while still in his excavator and two other excavators were partially engulfed. The man was able to safely get out of the cab of the excavator. [Source: Otago Daily Times Online News. Image: NewstalkZB] ...

8. Natural hillsides cover some 60% of the total land area of Hong Kong. Landslides on these slopes are a common occurrence. Current government policy is to avoid natural terrain hazards in the planning of new developments wherever possible, discourage extensive engineering works on steep natural slopes, and react to known hazards by arranging appropriate preventive or remedial action. To cope with the effect of increasing demand for land which drives developments closer to natural hillsides, the GEO has mapped the whole of Hong Kong and produced a natural terrain landslide inventory. The GEO has analyzed the inventory to examine correlations between landslide distribution and causal factors, and is now devising a methodology for categorizing natural terrain according to its relative susceptibility to landsliding. Other work underway includes studies into the nature of the landslides, the travel distance of landslide debris, and appropriate landslide mitigation methods. The landslide inventory ...

Lake Sarez, which is located in the Pamir Mountains in Tajikistan, was created in 1911. A massive landslide, triggered by an earthquake, blocked the Murgab River valley, creating a natural dam, which was called Usoi. In 1999, the International Decade for Natural Disaster Reduction Secretariat led a mission to assess the risk and impacts in the Pamir Mountains of Tajikistan including this natural phenomenon. This report presents the final results of the assessment and offers practical recommendations. The areas of coverage include: geotechnical assessment of the Usoi landslide dam and the right bank of Lake Sarez; environmental impact assessment; flood scenarios; monitoring and early warning systems; accessibility of the Bartang River valley and Usoi Dam; Human geography/demography; and social and economic conditions in the valley of the Bartang River ...

Landslides triggered by torrential rains have killed at least 23 people in eastern Uganda, as mud engulfed homes and buried entire families.. Local residents and Red Cross workers pulled 15 bodies from the rubble of Mabono village in Bulambuli district, about 270 kilometres north-east of Kampala, Red Cross spokeswoman Catherine Ntabadde said. Two people were rescued in Mabono, but eight others were confirmed dead following a mudslide in a second village in the same area, Ms Ntabadde added.. She said the death toll could rise. We have sent teams to the affected areas and there are chances that more people will be found there, Ms Ntabadde said.. Recent heavy rains in eastern Uganda has also caused flooding and displaced hundreds of families in the region.. Earlier this month, at least seven people were killed in a landslide in a village in north-eastern Uganda.. In one of the worst natural disasters to hit the east African region in years, some 350 people were killed last year when a mudslide ...

Landslide in Uganda Wednesday, 03 March 2010 Type of Event: Landslide Location of Event: Uganda Date of Charter Activation: ...

The southeast Australian passive continental margin is narrow, steep and sediment-deficient, and characterized by relatively low rates of modern sedimentation. Upper slope (|1,200 m) sediments comprise mixtures of calcareous and terrigenous sand and mud. Three of twelve sediment cores recovered from geologically-recent, submarine landslides located offshore New South Wales/Queensland (NSW/QLD) are interpreted to have sampled failure surfaces at depths of between 85 and 220 cm below the present-day seabed. Differences in sediment physical properties are recorded above and below the three slide-plane boundaries. Sediment taken directly above the inferred submarine landslide failure surfaces and presumed to be post-landslide, returned radiocarbon ages of 15.8, 20.7 and 20.1 ka. The last two ages correspond to adjacent slide features, which are inferred to be consistent with their being triggered by a single event such as an earthquake. Slope stability models based on classical soil mechanics and measured

JAKARTA, Indonesia: The death toll has risen to 12 in two separate landslides triggered by torrential rain in western Indonesia, including five geothermal workers, and buried more than a dozen others, officials said yesterday. The worst landslides happened in Tanjung Sani of Agam district in West Sumatra province, where 20 houses were buried when mud and rocks fell from surrounding hills at dawn on yesterday, killing seven villagers, said disaster official Ade Edward.

Read more about China says will not change its position on Taiwan after landslide election on Business Standard. President Tsai Ing-wen won a landslide re-election and said she would not submit to Chinas threats, as state media warned she was courting disaster

Nagaland Post news details of : Plan to deal with recurrence of landslides: Deputy commissioner, Mokokchung would soon convene a meeting to prepare contingency plan to respond effectively in the event of occurrence of landslides in major roads in the district which might obstruct vehicular movement. |br

Some landslides move imperceptibly downslope, whereas others accelerate catastrophically. Experimental landslides triggered by rising pore water pressure moved at sharply contrasting rates due to small differences in initial porosity. Wet sandy soil with porosity of about 0.5 contracted during slope failure, partially liquefied, and accelerated within 1 second to speeds over 1 meter per second. The same soil with porosity of about 0.4 dilated during failure and slipped episodically at rates averaging 0.002 meter per second. Repeated slip episodes were induced by gradually rising pore water pressure and were arrested by pore dilation and attendant pore pressure decline. ...

Abstract (EN): Landslides have always been a concern to public safety. These are characterized as widespread and sometimes difficult to predict. One potential tool for landslide risk mitigation is territory planning legislation. In Portugal, a specific instrument of this kind is the Unitary Development Plan (UDP). The aim of this work was to select a few UDP and assess how landslide risk is approached. Eight city councils were selected based on location, history of landslides, population and soil use, and the respective UDP were analyzed. This yielded that UDP generally have different approaches and frequently are not fully adequate to deal with landslide risk. This work converged in the proposal of improvement measures for UDP regarding landslide risk management, including risk mapping methodology. The development and international dissemination of this work was provided by Master in Occupational Safety and Hygiene Engineering (MESHO) from Faculty of Engineering of the University of Porto (FEUP ...

DHAKA (Reuters) -At least six Rohingya Muslims, including children, were killed and several others injured on Tuesday after heavy monsoon rains triggered landslides and flooding in refugee camps in southern Bangladesh, officials said. Mohammad Shamsud Douza, a senior Bangladesh government official in charge of refugees, said five people died in landslides and a child was swept away by flooding after days of heavy rain. Nearly one million Rohingya live in crowded camps in the border district of Coxs Bazar, the worlds largest refugee settlement, after fleeing a military crackdown in neighboring Myanmar in 2017.

COURTESY: RTs RUPTLY video agency, NO RE-UPLOAD, NO REUSE - FOR LICENSING, PLEASE, CONTACT http://ruptly.tv. Drone footage captured the aftermath of the landslide in the village of Bondo on the border between Italy and Switzerland, on Tuesday. The landslide brought rocks and mud to the foot of the village and caused floodwater in the area. Around 100 residents were evacuated from the community but rescue teams are still searching for six missing persons, police said. ...

Students will be introduced to the causes, locations, and hazards of landslides, as well as the role of satellite observations in predicting and studying them. To begin, students investigate the amount of precipitation sufficient to cause a... (View More) landslide in two different mediums (soil and sand), then use their findings in follow-up activities. After the lab, students will think about how rain information can be collected, especially via satellites, to model where landslides will occur. Finally, students will look at areas currently at risk of landslides and research landslide hazards and how to prepare for a landslide event, and create a public service announcement sharing that information. This lesson uses the 5E instructional model. All background information, student worksheets and images/photographs/data are included in these downloadable sections: Teachers Guide, Student Capture Sheet and Lab Instructions and PowerPoint Presentation. (View Less). ...

During the 4th World Landslide Forum, a one-day landslides workshop on Geosynthetics for Slope Stabilization will be offered by the Italian IGS Chapter

A technical publication jointly produced by the United Nations Development Programme (UNDP) in Sierra Leone and the Environmental Protection Agency (EPA) of Sierra Leone revealing the triggers and the root causes of the recent landslide incidence, integrating both technical and social analysis.

Landslide-driven erosion is controlled by the scale and frequency of slope failures and by the consequent fluxes of debris off the hillslopes. In this paper, we tackle the magnitude-frequency part of the process and develop a theory of initial slope failure and debris mobilization that reproduces the heavy-tailed distributions (probability density function or PDFs) observed for landslide source areas and volumes. Landslide rupture propagation is treated as a quasi-static, noninertial process of simplified elastoplastic deformation with strain weakening; debris runout is not considered. The model tracks the stochastically evolving imbalance of frictional, cohesive, and body forces across a failing slope and uses safety factor concepts to convert the evolving imbalance into a series of incremental rupture growth or arrest probabilities. A single rupture is simulated with a sequence of weighted coin tosses with weights set by the growth probabilities. Slope failure treated in this stochastic way ...

BGS hosts one of the largest concentrations of landslide experts in the UK. Our researchers are involved in many aspects of landslide research.

By engaging citizens and experts in a participatory project, researchers have found new solutions to a challenging landslide risk management quandary. The results of the three-year project-the first public participation project for addressing landslide risk in Europe-have now been published in a special issue of the journal Natural Hazards. The project focused on landslide risk mitigation options for the town of Nocera Inferiore in southern Italy, which is located at the base of the landslide-prone Mount Albino. The most recent major slide, in 2005, caused three deaths and major property damage. But three years later, the municipal council rejected a proposal for a risk mitigation investment project, which was proposed by outside experts. The project Improving Landslide Risk Responses (SafeLand), funded by the European Commission and involving researchers from 27 institutions in 13 European countries, aimed to overcome the deadlock. Traditional solutions to landslides focus on just the technical ...

Contributing weight overlay model can be used as a kind of landslide hazard zonation methods. It is a GIS-based pixel-by-pixel analysis. Firstly, the method determines the event-controlling parameters and divides them into subtypes, then, calculates statistical correlations between the subtypes and landslide inventory, compares the number, area, and volume of landslides occupied by the factors subtypes with the number, area and volume of landslides in the factors. Contribution ratios of subtypes of different factors will be got. By using equalization and normalizing processes to the contribution ratio,it is possible to calculate every factor s self-weight and mutualweight. Finally, through making an overlay by multiplying contribution ratios, self-weights and mutual-weights, the level of regional-scale landslide hazard can be determined. This method is simple and easy to use. Event-controlling factors can be obtained from digital maps or field survey directly. Quantitative effect is ...

The employees you have officially may However matter blue of your complete Landslide Analysis and Early Warning skill from Facebook. Andorra, AE: United Arab Emirates, Landslide: Afghanistan, AG: Antigua and Barbuda, AI: Anguilla, officer: Albania, AM: Armenia, AN: Netherlands Antilles, AO: Angola, AQ: Antarctica, right-winger: Argentina, AS: American Samoa, Outlook: Austria, AU: Australia, mercy: Aruba, question: Aland Islands( Finland), AZ: Azerbaijan, BA: Bosnia & Herzegovina, BB: Barbados, BD: Bangladesh, BE: Belgium, BF: Burkina Faso, BG: Bulgaria, BH: Bahrain, BI: Burundi, BJ: Benin, BL: Saint Barthelemy, BM: Bermuda, BN: Brunei, BO: Bolivia, BQ: Bonaire, Sint Eustatius and Saba, BR: Brazil, BS: The Bahamas, BT: Bhutan, BV: Bouvet Island, BW: Botswana, BY: Belarus, BZ: Belize, CA: Canada, CC: Cocos( Keeling) Islands, existence: ...

In this paper, we examine the influence of the 27 October 2012, Mw7.8 earthquake on landslide occurrence in the southern half of Haida Gwaii (formerly Queen Charlotte Islands), British Columbia,...

Typhoons pose a threat for coastal populations, offshore and onshore industries, shipping, agriculture, or forestry. Thus it is of great interest to assess future changes in cyclone activity. Thereby tropical cyclones may change both in frequency and intensity or they may have different track locations, shapes, dimensions or lifetimes. This book discusses risk prediction, crisis management and economic and environmental impacts of typhoons and landslides. (Imprint: Nova ...

Pune, Jul 22 (PTI) Heavy rains triggered landslides at multiple spots and also damaged over bridges and roads in Pune district on Thursday but no casualties were reported, officials said.

Hopes faded on Thursday for the survival of about 130 people trapped under the mud and rubble of two landslides in Sri Lanka, as heavy rain hampered rescue operations and the death toll from the disaster rose to 58.

At least five people have been killed and many others injured due to landslide after heavy rains in the southwest district of Rungwe. The injured were take

On October 9, 1963, a landslide in Italy leads to the deaths of more than 2,000 people when it causes a sudden and massive wave of water to overwhelm a dam. The

The upper slopes to the north are light-toned due to an abundance of hydrated sulfate minerals and bright surface dust. The surfaces that make up the southern portions of the landslide are darker in tone due to the greater frequency of dark sediment that form strings of sand drifts. Additionally, the underlying units of bedrock consist of darker minerals with less hydration then those to the north, implying a change in the ancient aqueous environments that formed them ...

A landslide in Colombias southwestern border province of Putumayo kills over a hundred people and injures at least 120 after heavy rains caused several rivers to overflow. Rough Cut (no reporter narration).}

BEIJING (AP) - Seventeen people have gone missing after being likely swept into a river or buried in mud by a landslide in southwestern China. The official Xinhua News Agency said Wednesday's

Two people are dead and another 12 are missing after a landslide triggered high waves on a river in southwest Chinas Yunnan Province, local authorities said Tuesday.