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Seismograms

The NCEDC archives many different types of seismic waveforms.

Broadband Stations - Map

Several different networks in northern California have broadband instruments and archive their data at the NCEDC. The Berkeley Digital Seismic Network (BDSN) is a sparse network of co-located broadband and strong-motion sensors in northern and central California. The Northern California Seismic Network (NCSN) includes some broadband stations along the northern coast of California. Four stations from the UNR network of broadband sites in eastern California and western Nevada are also archived here.

Borehole Stations - Map

There are a number of borehole stations in northern and central California. The High Resolution Seismic Network (HRSN) is focused on the Parkfield area of California while the Hayward Fault Network (HFN) is focused on the Hayward Fault and the Calpine/Unocal Network is focused on the Geysers Geothermal area. In addition, the NCSN also includes some borehole stations in the Mammoth Lakes/Long Valley area and the Mini-Plate Boundary Observatory (MPBO) project is a new deployment of borehole stations in the San Francisco Area.

In addition to these stations, the NCEDC hosts data from the SAFOD component of the Earthscope project. The San Andreas Fault Observatory at Depth is a deep borehole observatory that will directly measure the physical conditions under which plate boundary earthquakes occur. Seismic data from the SAFOD pilot hole are currently available.

Strong-motion Stations

Both the Berkeley Digital Seismic Network (BDSN) and the Northern California Seismic Network (NCSN) include strong-motion instrumentation. The strong-motion sites of the NCSN are primarily located in the San Francsico Bay Area, while the BDSN has strong-motion sensors collocated with each broadband sensor.

Short-period Stations

The Northern California Seismic Network (NCSN) was originally composed entirely of short-period stations.