This proposal covers significant upgrades to the Pacific Northwest Seismograph Network (PNSN). We are installing six high-dynamic-range strong-motion accelerographs (three of them funded under this agreement, and three under the PNSN operations agreement, 1434-95-A-1302) in the Puget lowland urban area. Data from these recorders will be rapidly integrated with PNSN network data. This requires new data acquisition techniques, and changes to the PNSN real-time processing and information distribution system.

Results

Terra Technology IDS-24 instruments were chosen based on instrumental testing and competitive bids and several installation sites have been selected. These include a site at the UW (co-sited with the SEA Wood-Anderson instruments which have operated since 1966), Seward Park in Seattle (site of currently operating station SPW), the Bonneville Power Authority (BPA) Maple Valley substation near Renton, and a seismic pier at the University of Puget Sound in Tacoma. Data from some instruments will be available by real-time telemetry as part of the PNSN data stream. Data from other instruments will be recovered via dial-up or site visit. Three of the sites will have six-channel data loggers to record three channels of strong-motion (FBA) and three channels of broad-band velocity (Guralp CMG-40T). Automatic integration of data from these instruments with those of the other PNSN seismographs is being developed.

The PNSN strong-motion instrument program is soliciting cooperation from regional utilities and industries for assistance in siting, telemetry, instrumentation and cooperative operations of strong-motion instrumentation within our network area. We are developing procedures for rapid communication of strong-motion parameters of engineering interest to strong-motion program participants and to other interested parties.

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