Skip to content Skip to navigation

Seismic monitoring station, JRSC

Berkeley Digital Seismic Network, Greg Beroza (Stanford Geophysics), U.S. Geological Survey

Summary

The Jasper Ridge seismic station (JRSC) was installed in 1994 by a team from Stanford (Robert Kovach, Geophysics), the USGS, and UC Berkeley. It is part of a network of seismic stations in northern and central California maintained and operated by the Berkeley Digital Seismic Network (BDSN). Bill Karavas of UC Berkeley maintains the JRSC. The station consists of a highly sensitive seismometer that sits on a concrete pad inside a pre-existing cave on the west shore of Searsville Lake. The cave is overlain by 30 vertical feet of bedrock, and is sealed with a steel bulkhead door. Both of these features help make the station seismically quiet. 

The seismometer records signals in a digital format over a broad frequency band ranging from 0.008Hz to 50Hz, with an overall dynamic range of 200dB. This means that nearby magnitude 6+ earthquakes will not saturate the system, yet much smaller magnitude earthquakes (ca. M=1) can also be detected.

Data from the station are continuously transmitted to UC Berkeley and the USGS by a leased telephone line. The Berkeley Digital Seismic Network maintains a website where you can create and view seismograms from JRSC and other stations. Data are available at this website one hour after recording.

Section of the JRSC seismogram for the Dec.26, 2004 tsunami earthquake.

Project Location (Sector 30)

Visible from Trail/Road

14 - Lakeside

E - Chaparral Fire Road