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125 Years of Sound Science, serving society

BRIB - Briones Reserve, Orinda, CA, USA

Station Name BRIB (BRIB)
In Operation 1995/06/23 16:00:00 - Present
Elevation: 219.70 meters
Instrumentation Broadband

  • Site


    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.


    BK, BARD, UL (Berkeley Digital Seismic Network, Hayward Fault Network, Mini PBO Network, Bay Area Regional Deformation Network, USGS Low Frequency Network)



    Vault/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
  • Plots & Figures

    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





  • Instrumentation

    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
    GPSTrimble NetRSAshtech 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
    Sacks-Evertson Dilational StrainmeterBASALT8XBV?,HV?,LV?40
  • Data & Metadata

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

    Waveform Data

    GPS Data

  • Data Quality

    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