Geologists and engineers are assessing the stability of a scenic Puget Sound area after a large landside thundered down a hillside, knocking one house off its foundation and threatening others. In this aerial photo, a landslide is shown near Coupeville, Wash. on Whidbey Island, Wednesday, March 27, 2013. Whidbey Island authorities say one home has been severely damaged by the landslide that has isolated or threatened 33 more homes in the community overlooking Puget Sound about 50 miles north of Seattle.