BRIB - Briones Reserve, Orinda, 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 BRIB (BRIB)
In Operation 1995/06/23 16:00:00 - Present
Elevation: 219.7 meters
Instrumentation Broadband


Site is located at the Russell Reservation Field Station of UC Berkeley's College of Natural Resources, adjacent to Briones Regional Park in Orinda, California. This is a collaborative site with instrumentation for the BDSN, HFN, BARD, and the USGS strainmeter networks. This site is known as SFRRL in the USGS network.


Berkeley Digital Seismic Network (BK)
Northern Hayward Fault Network (BK)
Mini Plate Boundary Observatory Network (BK)
Bay Area Regional Deformation Network Network (BARD)
USGS Low Frequency Network (UL)



Borehole Conditions

The instruments are sited in a borehole located on the Russell Reservation. Geophysical instruments are installed at three levels in the 108-meter deep hole. A dilatometer strainmeter, part of the USGS strainmeter network, is installed at the depth of 162 meters. Above the strainmeters, the 6-component HFN package is installed at a depth of 119 meters. The Guralp CMG-3T seismometer of the BDSN is installed at a depth of 35 meters. The FBA-23 is installed at the surface of the borehole. The BARD GPS receiver is located up the hill.

On 11/19/1996, the Seismological Laboratory installed a second CMG-3T in a small tank at the surface. Data recording of this sensor replaced the borehole instrument. This site experienced frequent tilts, primarily due to changes in ground water content. In the fall of 2000, BSL engineers installed a post-hole and relocated the Guralp CMG-3T from the borehole to this site. Recording of the post-hole installation began on 12/20/2000. The Guralp in the surface tank has been removed.

GPS Monument Description

Poured concrete cylinder with steel reinforcement

Seismic Station Pictures

Installation of BRIB borehole package

Installation of BRIB borehole package

Work on the borehole

Work on the borehole

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
BroadbandGuralp CMG-3T Broad Band SeismometerQ330HR-GFEBH?,HH?,LH?,VH?00
AccelerometerKinemetrics FBA ES-T Accel. GFE (4 g max 5 v/g)Q330HR-GFEHN?00
Wilcoxon 731A Accel. (0.5 g max 10 v/g)BASALT8XBN?,CN?,LN?40
GeophoneOyo GeoSpace GS-11 Horizontal GeophoneBASALT8XDP?,LP?,SP?40
Oyo GeoSpace GS-11 Vertical GeophoneBASALT8XDP?,LP?,SP?40
GPSSeptentrio PolaRx5Ashtech Choke-RingSCIGN Tall-
SensorDataloggerSEED ChannelsLocation
Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes)Q330BQ?,LQ?,VQ?10
ElectroMagnetics Inc. BF4 MagnetometerQ330BT?,LT?,VT?20
Sacks-Evertson Dilational StrainmeterBASALT8XBV?,HV?,LV?40

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
BRIB completeness last year
BRIB 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
BRIB multipath last year
BRIB multipath lifetime