Comparative cross-sections of seismicity beneath Mount St. Helens and Mount Rainier, 1981-1996. There is no vertical exageration. Locations extend only up to 1.1 km above sea level, an artifact caused by our location program which treats the surface of the earth as the average elevation of all seismograph stations used to locate events at each volcano. Each cross-section includes only earthquakes located directly beneath each volcano.

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