[sodpoodle]

Diagrams and more info here:

https://www.dnr.wa.gov/rattlesnake-hills-landslide

[Sicvee]

Nice analysis at the link. They did not assign any blame, but it looks to me like the quarry operations caused the landslide. They should be responsible for mitigating its effects.

[Cold Heart]

Thanks. Was watching that on local TV but your link gave a lot better info. Controlled explosives could work, even directing the flow into the quarry.

[nwrep]

Impressive planning and monitoring. Thanks.

[fruser1]

A couple nice subsidence pics at their flicker link on the site you mention. I like this, rather foreboding one the best: