What triggered the Oso landslide?

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.

What type of landslide was the Oso Washington landslide?

The landslide involved a complex sequence of events—including rotation, translation, and flow mechanisms—and can be referred to as a debris-avalanche flow. Studies indicate that slope failure occurred in two stages over the course of about 1 minute.

Who survived the Oso mudslide?

Duke Suddarth, Infant Boy Who Survived Oso Mudslide, Defies the Odds. Duke Suddarth was just 22-weeks-old when he and his mother were swept up in the deadly Washington state mudslide last March. Both barely survived.

What happened during the Oso landslide?

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.

When did the Oso landslide happen in Washington State?

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. Landslide debris blocked the North Fork Stillaguamish River, destroyed about 40 homes and other structures,…

Who was president at time of Oso mudslide?

On April 3, the mudslide was declared a major disaster by President Barack Obama. The declaration was requested on April 1 by Governor Inslee, who stated that approximately 30 families needed help with housing and other needs.

Where is the unstable area of the Oso mudslide?

The unstable area is the area of lighter green trees to the right and beneath the river section that is visible. The mudslide flowed towards the upper left, across the river. All of the houses visible in the image were destroyed.

Where is the headcarp in the Oso landslide?

USGS hydrologist Mark Reid examines an extensional basin in the middle of the Oso landslide deposit. The headscarp (near-vertical cliff at the back of the landslide) is visible at the top of the image. The prominent tree is one of many that fell and became perched as the landslide spread out over the river valley.