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125 Years of Sound Science, serving society

FARB - Farallon Islands, CA, USA

Station Name FARB (FARB)
In Operation 1997/03/15 00:00:00 - Present
Latitude
Longitude:
Elevation: -18.50 meters
Instrumentation Broadband
GPS


  • Site

    Location

    Site is located on the Farallon National Wildlife Refuge, offshore of San Francisco, and is under the auspices of the US Fish and Wildlife Service. This is a particularly tricky site for maintenance, since access to the Island is limited. This site experiences loss of power from time to time, due to problems with the island generator. Despite the 15 batteries, there are periods of time when the station is down due to loss of power. This site also experiences occasional problems due to corrosion of cables.

    Network

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

    Geology

    Granite

    Vault/Borehole Conditions

    The sensors are installed in a near-surface vault and covered with rocks and foam in order to provide thermal stability.

    GPS Monument Description

    Threaded 5/8" rod cemented 0.8m deep into bedrock
  • Plots & Figures

    Seismic Station Pictures

    Site of FARB vault

    Site of FARB vault

    Aerial photograph of island

    Aerial photograph of island

    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

    FARB

    FARB

    FARB

    FARB

  • Instrumentation

    Table of Seismic Instrumentation

    SensorDataloggerSEED ChannelsLocation
    BroadbandStreckeisen STS-2 VBB Tri-Axial SeismometerQ330HR-GFEBH?,HH?,LH?,VH?00
    AccelerometerKinemetrics FBA ES-T Accel. (2 g max 10 v/g)Q330HR-GFEHN?00
    ReceiverAntennaRadome-
    GPSTrimble NetRSAshtech Choke-ringSCIGN Tall-
    SensorDataloggerSEED ChannelsLocation
    AuxiliaryAntennaCurrentQ330HR-GFEVE?00
    ClockPhaseQ330HR-GFELC?,VC?00
    ClockQualityQ330HR-GFELC?,VC?00
    InputVoltageQ330HR-GFEVE?00
    SystemCurrentQ330HR-GFEVE?00
    SystemTemperatureQ330HR-GFEVK?00
    VCOValueQ330HR-GFEVC?00
  • 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


    Completeness

    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
    FARB completeness last year
    Lifetime
    FARB completeness lifetime

    Multipath

    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
    FARB multipath last year
    Lifetime
    FARB multipath lifetime