195:, area, causing substantial damage and seven deaths. This event spurred the installation of the Pacific Northwest Seismic Network in 1969 to monitor regional earthquake activity. Early in 1980 PNSN scientists detected unrest under Mt. St. Helens and by March 1980 predicted an eruption was likely to occur "soon". On March 27 the first steam and ash explosion occurred. The PNSN expanded to better monitor Mt. St. Helens and other Cascade Volcanos leading up to the deadly May 18 eruption and in the years following.
238:. After an earthquake on January 30, 2009, the network's emergency notification system failed. A magnitude 4.3 earthquake in February 2015 showed that the present architecture of the network results in a significant delay in the early warning notification program, depending upon the location of the quake, leading to proposals to again expand the network. The early warning notification program was implemented with its reliability contingent upon unknown future funding, but with the election of
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The network was significantly expanded after the damaging
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Seismological observatories, organisations and projects
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183:and the M7.0–7.3 earthquake in about 900AD on the
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223:volcanoes. The PNSN, in conjunction with the
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203:Earthquakes are recorded frequently beneath
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119:Learn how and when to remove this message
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293:The network is funded primarily by the
440:"About section from official website"
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442:. Pacific Northwest Seismic Network
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217:1980 Mt. St. Helens eruption
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333:. January 31, 2009.
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