Earthquakes are recorded frequently beneath Mount St. Helens , Mount Rainier , and Mount Hood . After successfully using seismic activity to predict the 1980 Mt. St. Helens eruption , monitoring was expanded to other Cascade Mountains volcanoes . The PNSN , in conjunction with the Cascades Volcano Observatory of the USGS , now monitors seismicity at all the Cascade volcanoes in Washington and Oregon . The network was significantly expanded after the damaging 2001 Nisqually earthquake . 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 Donald Trump " future funding is uncertain " according to Washington Congressman Derek Kilmer . The president 's budget for the fiscal year commencing October 1 , 2018 calls for reductions in funding and staff for the early warning notification program
2001 Nisqually earthquake
2001 Nisqually earthquake
Pacific Northwest Seismic Network