JRSC - Jasper Ridge Biol. Preserve, Stanford, CA, USA

We operate broadband and borehole stations under the network code BK. The Berkeley Digital Seismic Network (BDSN) is a regional network of very broadband and strong motion seismic stations designed to monitor regional seismic activity as well as provide high quality data. The Berkeley borehole stations have borehole geophones or other seismic sensors and may have other geophysical instrumentation.

BARD is our GPS network for monitoring crustal deformation across the Pacific-North America plate boundary and in the San Francisco Bay Area for earthquake hazard reduction studies and rapid earthquake emergency response assessment

Station Name JRSC (JRSC)
In Operation 1994/06/30 21:20:00 - Present
Elevation: 70.5 meters
Instrumentation Broadband


The site is located in the Jasper Ridge Biological Preserve in Stanford, California. It is the replacement installation for the STAN location and is operated cooperatively with Stanford University.


Berkeley Digital Seismic Network (BK)
Bay Area Regional Deformation Network Network (BARD)



Borehole Conditions

The vault is located in an east/west adit, 20' in length, constructed for the development of Searsville Dam (circa 1900). The instruments are located in an aluminum pressure tank on a concrete pier. Apporoximately 4 meters of overburden cover the adit. The datalogger and accessory equipment are located in front of the adit.

GPS Monument Description

Short brace monument installed in hard rock.

Seismic Station Pictures

Aerial photograph of Jasper Ridge<br>Courtesy of the JRBP

Aerial photograph of Jasper Ridge
Courtesy of the JRBP

Typical STS-2 installation

Typical STS-2 installation

GPS Station Timeseries

Time series processing at the BSL

Last year Clean Clean & detrended Raw Raw & detrended
Lifetime Clean Clean & detrended Raw Raw & detrended
Text file (final results only) Clean Raw

GPS Station Pictures

Table of Seismic Instrumentation

SensorDataloggerSEED ChannelsLocation
BroadbandStreckeisen STS-2 VBB Tri-Axial SeismometerQ330HR-GFEBH?,HH?,LH?,VH?00
AccelerometerTSA-100S (4 g max 5 v/g)Q330HR-GFEHN?00
GPSTopcon Net-G3ATopcon Choke-RingSCIGN Tall-
SensorDataloggerSEED ChannelsLocation
OthersElectric Field Dipole (Pb-PbCl or Cu-CuS Anodes)Q330BQ?,LQ?,VQ?10
ElectroMagnetics Inc. BF4 MagnetometerQ330BT?,LT?,VT?20

Waveforms and associated metadata, and GPS data, are available at the Northern California Earthquake Data Center (NCEDC).

Waveform Data

GPS Data

Noise Analysis

View more noise plots

GPS Data Quality


Data completeness is defined both as "Completeness of observations" and "Cycle slips per observation". "Completeness of Obs." is the number of epochs in the final RINEX file normalized to the expected number. This percentage will go down if time is missing from the RINEX file. "Cycle slips per Obs." is the total number of detected cycle slip normalized to the total number of observations in the RINEX file. This number will increase as the receiver loses lock on satellites more frequently.

Previous Year
JRSC completeness last year
JRSC completeness lifetime


The effects of multipath on the data are estimated by parameters for L1 and L2 (MP1 and MP2 respectively); see Estey and Meertens (GPS Solutions, 1999) for derivation. The daily value is the RMS of MP1 and MP2 throughout the day and for all satellites. Higher values indicate a greater prevalence and/or strength of multipathing, i.e. objects on the ground are providing multiple reflection pathways from the satellite to antenna.

Previous Year
JRSC multipath last year
JRSC multipath lifetime