Landslides

landslides

Dating of landslides around Oso reveals recurring patterns

On March 22, 2014, after a period of heavy rain, a hillside near the town of Oso, Wash., collapsed, sending 7.6 million cubic meters of mud and debris across the North Fork of the Stillaguamish River, destroying a rural neighborhood and killing 43 people. The slide took Oso residents by surprise, but scientists say the event was not altogether unexpected, as evidence for dozens of past landslides can be found throughout the Stillaguamish River Valley. New research suggests that large slides have occurred in the Oso vicinity even more frequently than previously suspected.

07 Jun 2016

Comment: Assessing the threat from massive rock slope failures in the Norwegian fjordlands

Records dating back to the Vikings describe large rock avalanches into Norwegian fjords that set off lethal displacement waves. Today, increased development and tourism are exacerbating the risk.

21 May 2016

Laser experiments illuminate landslide physics

How does cereal pour from the box? Why do grains of wheat become wedged inside a hopper? What happens to soil when a slope collapses in a landslide? And, more broadly, what do these diverse phenomena have to do with each other?
 
11 Jul 2015

Red Planet Roundup: May 2015

With two rovers patrolling the surface of Mars, five spacecraft in orbit above it, and scientists back here on Earth studying the Red Planet from afar, new findings are announced almost weekly. Here are a few of the latest updates.

15 May 2015

Down to Earth With: The USGS Landslide Response Team

Over the last year and a half, the Western U.S. has suffered a rash of devastating landslides. The streak began in September 2013, when heavy rains triggered widespread debris flows across the Colorado Front Range. Then came the tragic landslide that buried Oso, Wash., killing 43 people. Two months later, the West Salt Creek slide, a behemoth rock avalanche in western Colorado, killed three people as it barreled down a 5-kilometer-long path.

21 Mar 2015

Tohoku tsunami may have gotten a boost from submarine slump

When the magnitude-9 Tohoku earthquake hit Japan on March 11, 2011, the mainshock triggered tsunami waves averaging about 10 meters in height by the time they reached the coast of Japan, from Fukushima in the south to the northern tip of Honshu Island. But one mountainous stretch of coastline known as Sanriku, about 100 kilometers north of the main rupture area, saw waves higher than 40 meters. This oddity has led some scientists to suggest that a submarine landslide, triggered by the earthquake, may have contributed to the tsunami’s extreme height in this region.

 
04 Feb 2015

Utah gravity slide was one for the record books

When Washington state’s Mount St. Helens erupted in 1980, the volcano’s northern flank gave way, sending about 2.5 cubic kilometers of material down its slopes and into nearby valleys in what was the largest debris avalanche in recorded history. But roughly 22 million years earlier, one of the largest-known volcanic landslides the world has ever seen occurred in southwestern Utah, according to a study in Geology. That one, estimate the study’s authors, released between 1,700 and 2,000 cubic kilometers of ash, tuff and sandstone — nearly 1,000 times as much as Mount St. Helens — over a 3,400-square-kilometer area.

09 Jan 2015

Benchmarks: October 9, 1963: The Vajont Landslide kills 2,500 in Italy

In 45 seconds, everything changed. What had been a towering mountainside collapsed into a pile of rubble; what had been a deep reservoir of placid water became a lethal flood; what had been a valley of small Italian villages was leveled to a barren outwash plain.

09 Oct 2014

Oso landslide report yields some answers

Early on March 22, 2014, the most damaging landslide in U.S. history devastated the community of Oso, Washington. Forty-three people perished, most inside their homes, when a saturated hillside nearby gave way and a massive mudflow swept over their neighborhood. On July 22, a search crew recovered the last of the 43 bodies, exactly four months after the landslide, and coincidentally on the same day, a team of scientists and engineers released an exhaustive report detailing the event and its implications.

01 Aug 2014

Comment: The Oso landslide shows need for insurance and better planning

The deadly landslide that struck near Oso, Wash., in March killed more than 40 people and caused tens of millions of dollars in damage, most of which was not covered by insurance. The landslide was not a surprise to geologists. Could this disaster have been prevented — or can future disasters be prevented?

06 May 2014

Pages