April Image of the Month: Ledgewood–Bonair Landslide, Whidbey Island, WA

Thanks to our hazards geologists and landslide experts, Isabelle Sarikhan and Stephen Slaughter, we were able to bring you detailed pictures (including this month’s photo) and information on this large Whidbey Island landslide event immediately after its occurrence on March 27, 2013! As we blogged last week, the hazards team released a Quick Report on March 28 detailing their initial on-site investigation of the Ledgewood-Bonair (LB) Landslide. The report suggests that the LB event may be a reactivation of a portion of a larger, prehistoric (~11,000 years old) landslide complex, which extends approximately 1.5 miles along the Whidbey Island coastline. According to the report, “the dimensions of the [LB] landslide are approximately 1100 feet long (measured parallel to the shoreline) and about 300 feet into Puget Sound. Initial estimations place the volume of material mobilized as great as 200,000 cubic yards (~40,000 dump truck loads).”

To see more images of the LB Landslide click here to visit the DNR Flickr site.