Dave Petley has a very good post up on the Oso/Hazel/Steelhead Landslide that is well worth looking at it. He utilizes the better refined seismic signal, the very good images from the Governor's fly over and his many years of study and perspective on landslides. The post is blogs.agu.org/landslideblog - oso-mechanisms. I concur with his take and may add a few bits later. Having read the Landslide Blog routinely for many years it is good to read Dave's take and perspective on this horrible event.