Red dots represent events occuring in the past month. Green dots represent events occuring less than a year ago, but more than a month ago. Circles represent older events.
Triangles represent PNSN seismic stations.
Station names are listed below each triangle. Black squares represent major cities. Black star indicates approximate position of Mt. Adams summit. Time-Depth Plot Graph showing relationship between time and depth of earthquakes beneath Mount Adams. In this graph, sea level is equal to 0 km depth.