FARB - Farallon Islands

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 FARB (FARI)
In Operation 1994-01-26 16:00:00 -0800 - Present
Elevation: -20.8514 meters
Instrumentation Broadband


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. The FARB site also is home to the continuously operating BARD station FARI.


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



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

Shallow-drilled braced monument in bedrock.

Seismic Station Pictures

Site of FARB vault

Site of FARB vault

Aerial photograph of island

Aerial photograph of island

GPS Station Daily Timeseries

GPS Station Pictures





Table of Seismic Instrumentation

SensorDataloggerSEED ChannelsLocation
AccelerometerEPISENSOR ES-TQ8HN?,LN?00,S0

GPS Instrumentation


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
FARI completeness last year
FARI 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
FARI multipath last year
FARI multipath lifetime

Signal-to-Noise Ratio

The Signal-to-Noise ratios are the mean values above the QC elevation mask for L1 and L2 respectively.

Previous Year
FARI SNR last year
FARI SNR lifetime