The effects of shallow sediments were apparent when the Kingdome sports stadium in south Seattle was imploded in 2000. The U.S. Geological Survey recorded the ground shaking on 200 seismographs installed specifically for this purpose. The movie of the ground shaking shows the seismic noise caused by the stadium falling down in the first 20 seconds (red colors), then a much larger amplitude of shaking for a much longer time period in the Duwamish River valley near the south-central portion of the map (especially obvious in the last 20 sec of the movie). This strong shaking and long duration is caused by energy being trapped in the soft deposits filling the river valley. Another area of stronger, longer ground shaking occurs along the shore of Lake Washington. We do not have an obvious explanation for this area of strong shaking, but possibilities include shallow deposits or energy being trapped along the shore of the lake.