Some stations include up to 6 components. PNSN stations in southern and central Oregon are maintained by the University of Oregon under Cooperative Agreement HQ98AG01928 . The PNSN exchanges real-time data with adjacent networks to improve our ability to locate earthquakes on the edge of our network. Seismograph stations operated by or recorded at the PNSN at the end of September, 2000.
Purple squares show the locations of strong-motion stations.
For all earthquakes, updates of information are posted to Web-pages each time the analyst finalizes a group of locations and magnitudes. In addition to ordinary phone lines, the PNSN has a radio link to the Washington State Dept. of Emergency Services, and an independent direct phone link to the City of Seattle Emergency Operations Center. Although the PNSN collected web-based felt reports on its own for several years, the USGS has historically been responsible for collecting, compiling, and interpreting U.S. earthquake intensity data. If continuous data transmission fails, the data will still be available via dial-up retrieval or site visit. Three additional dial-up stations are operated by the USGS in the Portland area.