Where was the landslide in Washington state?
Oso
On March 22, 2014, 43 people die when a portion of a hill suddenly collapses and buries a neighborhood in the small community of Oso, Washington, some 55 miles northeast of Seattle. It was one of the deadliest mudslides in U.S. history.
What caused the landslide in Oso Washington?
Oso mudslide and recovery timeline 1900s – Seasonal high water begins eroding the hill that eventually gave way in the 2014 mudslide. The Stillaguamish River channel pushes north. 1930s to 1950s – Logging is the economic engine of the Oso area. Some of the logged area is sensitive to shifting because of groundwater.
How large an area was covered by the March 2014 Oso Washington landslide?
approximately 1 square mile
A portion of an unstable hill collapsed, sending mud and debris to the south across the North Fork of the Stillaguamish River, engulfing a rural neighborhood, and covering an area of approximately 1 square mile (2.6 km2). Forty-three people were killed and 49 homes and other structures destroyed.
Where was the big mudslide in Washington state?
Landslide debris blocked the North Fork Stillaguamish River, destroyed about 40 homes and other structures, and buried nearly a mile of State Route 530. Most tragically, it caused 43 fatalities in the community of Steelhead Haven near Oso, Washington. Oso was emblematic of a worst-case landslide scenario.
How many homes were wiped out by the Oso landslide?
40 homes
Landslide debris blocked the North Fork Stillaguamish River, destroyed about 40 homes and other structures, and buried nearly a mile of State Route 530. Most tragically, it caused 43 fatalities in the community of Steelhead Haven near Oso, Washington.
What was the worst landslide ever?
The largest landslide formed a 255-metre-high (837 ft) landslide dam on the Min River. This landslide killed all but one of the 577 people in the town of Deixi. The dam then overtopped, causing a flood and 2,500 deaths.
What is the largest landslide ever recorded?
Mount St. Helens volcano
The largest subaerial (on land) landslide in Earth’s recorded history was connected with the 1980 eruption of Mount St. Helens volcano in Washington state, USA.
When did the landslide in Washington State happen?
(Credit: Ben Pauk, USGS. Public domain.) The Oso landslide, also known as the SR 530 landslide, occurred in northwest Washington state on March 22, 2014, leading to devastating loss of life and destruction of property.
How much does it cost to clean up Washington landslides?
Indirect costs, such as loss of property value and tax revenue, and environmental effects, such as the degradation of water quality, can exceed direct costs. The Washington Department of Transportation routinely budgets $15 million a year for cleanup of landslides on highways.
What was the cause of the Oso landslide in Washington?
This accelerated movement was caused by the liquefaction of the saturated soils underneath the landslide, allowing the moving soil to quickly hydroplane across the river valley. Did Scientists Expect the Oso Landslide to Happen?
How many deaths are caused by landslides each year?
Nationally, landslides exceed $2 billion in loss each year and result in an estimated 25–50 deaths (1996 estimate). The Washington Geological Survey works to increase public and scientific understanding of landslide hazards in Washington State.