Links U.S. Army Corps of Engineers Howard Hansen Dam. Small, white, square enclosure on crest in middle of dam houses strong-motion recorder.
Motions recorded by instrument are suspect due to damage to enclosure.
Click on image for larger version. Crack in embankment in center of picture due to strong ground shaking. Click on image for larger version. Closeup of instrument housing building. Note tilt due to downslope movement of building.