I just got off the phone with Peter Goldman of the Washington Forest Law Center, who pointed me to this video:
It's a stark reconstruction of the logging and subsequent ground movement on the Hazel slope. One dramatic change in the landscape happens in 2006, around the 9:25 mark. The guy who put the video together is not a geologist, Goldman said, "and I'm not sure he got all the geology right, but I think he may be on to something. I'm not sure he was 100 percent right about cause and effect, but there was logging and there was slumping afterwards."