SAO - San Andreas Geophysical Obs., Hollister, CA, USA
|Station Name||SAO (SAOB)|
|In Operation||1988/01/28 00:00:00 - Present|
LocationSite is located at the San Andreas Geophysical Observatory in the Hollister Hills State Vehicle Recreation Area. The BSL first occupied this site in 1966, with a variety of geophysical instrumentation. The digital broadband sensors were installed in 1988.
SAO is a cooperative station with the Advanced National Seismic System.
NetworkBK, BARD (Berkeley Digital Seismic Network and Bay Area Regional Deformation Network)
GeologyJurassic-Cretaceous Gabilan Granite
Vault/Borehole ConditionsThe vault is a buried steel culvert liner with a set of three isolation doors leading to the interior. The pier is poured concrete. The datalogger and supporting equipment are located in an air-conditioned structure approximately 50' away and connected via underground conduits. The seismometers are thermally insulated with 4" of polyurethane foam.
Plots & Figures
View of SAO equipment building
View of SAO vault
- 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
Sensor Datalogger SEED Channels Location Broadband Streckeisen STS-1/E300 VBB Feedback Seismometer Q330HR-GFE BH?,HH?,LH?,VH? 00 Accelerometer Kinemetrics FBA ES-T Accel. GFE (4 g max 5 v/g) Q330HR-GFE HN? 00 Receiver Antenna Radome - GPS Trimble NetRS Ashtech Choke-Ring SCIGN Tall - Sensor Datalogger SEED Channels Location Others Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes) Q4120 BQ?,LQ?,UQ?,VQ? ElectroMagnetics Inc. BF4 Magnetometer Q4120 BT?,LT?,UT?,VT? Auxiliary Battery Voltage Q4120 AE? Internal Temperature Q4120 AK? AntennaCurrent Q330HR-GFE VE? 00 ClockPhase Q330HR-GFE LC?,VC? 00 ClockQuality Q330HR-GFE LC?,VC? 00 InputVoltage Q330HR-GFE VE? 00 SystemCurrent Q330HR-GFE VE? 00 SystemTemperature Q330HR-GFE VK? 00 VCOValue Q330HR-GFE VC? 00
Data & Metadata
Waveforms and associated metadata, and GPS data, are available at the Northern California Earthquake Data Center (NCEDC).
- BK Information Directory, including
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 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.
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