Pacific Northwest Seismic Network
The Pacific Northwest Seismic Network, or PNSN, collects and studies ground motions from about 400 seismometers in the states of Oregon and Washington to monitor volcanic and tectonic activity, and gives advice and information, and works to mitigate earthquake hazard.
Damaging earthquakes are well known in the Pacific Northwest, including several larger than magnitude 7, most notably the M9 Cascadia earthquake in 1700AD and the M7.0-7.3 earthquake in about 900AD on the Seattle Fault. In 1965, a magnitude 6.5 earthquake shook the Seattle, Washington area causing substantial damage and seven deaths. This event spurred the installation of the Pacific Northwest Seismic Network (PNSN) in 1969 to monitor regional earthquake activity.
Earthquakes are recorded frequently on 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 of the Cascade volcanoes in Washington and Oregon.
The Network operates from the Earth and Space Sciences Department at the University of Washington in Seattle, and its data archiving is abetted by the Data Management Center of IRIS Consortium in Seattle. It is the second largest of the regional seismic networks in the ANSS (Advanced National Seismic System) and with more data than the networks in the states of Alaska, Utah, Nevada, Hawaii and the New Madrid, Missouri-Tennessee-Kentucky-Arkansas area.
The network is funded primarily by the United States Geological Survey which stations its own staff on the campus although the network is ostensibly managed by UW staff. Additionally the Department of Energy and the State of Washington provide funding. The network was significantly expanded in 2001 after the damaging Nisqually Quake, but immediately after a medium sized earthquake on January 30th, 2009 the network's emergency notification failed. Paul Bodin is the network manager.
- Pacific Northwest Seismic Network (official website)
- PNSN Twitter (@PNSN1)
- PNSN Instagram (@PNSN1)
- PNSN Google+
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