The Ledgewood-Bonair Landslide, as it is also being called) on Whidbey Island, Island County, Washington occurred around 3:45 am on March 27, 2013. It is a small portion of a much larger landslide complex, approximately 1.5 miles long, that was prehistoric and may date back as far as 11,000 years. The top of the landslide scarp averages 200 feet above sea level, and the landslide pushed (uplifted) the beach as high as 30 feet above the shore. The toe (front of landslide at the beach) is slightly over 1,100 feet long and extends approximately 300 feet into Puget Sound. Uplift of the beach is presumed to have been relatively slow (i.e., over a few minutes). The volume of material moved was approximately 200,000 cubic yards (equivalent [...]
Summary
The Ledgewood-Bonair Landslide, as it is also being called) on Whidbey Island, Island County, Washington occurred around 3:45 am on March 27, 2013. It is a small portion of a much larger landslide complex, approximately 1.5 miles long, that was prehistoric and may date back as far as 11,000 years. The top of the landslide scarp averages 200 feet above sea level, and the landslide pushed (uplifted) the beach as high as 30 feet above the shore. The toe (front of landslide at the beach) is slightly over 1,100 feet long and extends approximately 300 feet into Puget Sound. Uplift of the beach is presumed to have been relatively slow (i.e., over a few minutes). The volume of material moved was approximately 200,000 cubic yards (equivalent to 40,000 dump truck loads). About 34 homes were affected by this landslide.
(Information and photos are from the Department of Natural Resources, Washington Geological Survey)
Click on title to download individual files attached to this item.
WhidbeyIsland6.jpg
845.71 KB
image/jpeg
Rights
This USGS product is considered to be in the U.S. public domain. For further information on the USGS Information Policies and Instructions, refer to the Copyrights and Credits section on this web page: http://www.usgs.gov/laws/info_policies.html