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Figure 3. Active seismograph stations in the Pacific Northwest in 1987. Stations operated by the University of Washington are shown as triangles, Canadian stations as squares. Seismic signals from the University's stations are received in Seattle. Signals from stations shown as solid triangles are also transmitted to the National Earthquake Information Service in Golden, Colorado. Station LON, at Mount Rainier, is part of an international recording system known as the World Wide Standard Seismograph Station Network (WWSSN). At LON six seismometers measure the various kinds of seismic waves shown in Figure 2.

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