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SAO - San Andreas Geophysical Obs., Hollister, CA, USA |
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View of SAO equipment building |
1988/01/28 00:00:00 - Present
Latitude: 36.7640
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View of SAO vault |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Noise Characteristics |
Data Availability
- Location:
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Site 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.
- Geology:
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Jurassic-Cretaceous Gabilan Granite
- Vault/Borehole conditions:
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The 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.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location AntennaCurrent Q330HR-GFE 2010/05/20 Present VE? 00 ClockPhase Q330HR-GFE 2010/05/20 Present LC?,VC? 00 ClockQuality Q330HR-GFE 2010/05/20 Present LC?,VC? 00 InputVoltage Q330HR-GFE 2010/05/20 Present VE? 00 Kinemetrics FBA ES-T Accel. GFE (2 g max 10 v/g) Q330HR-GFE 2010/05/20 Present HN? 00 Streckeisen STS-1/E300 VBB Feedback Seismometer Q330HR-GFE 2012/09/18 Present BH?,HH?,LH?,VH? 00 SystemCurrent Q330HR-GFE 2010/05/20 Present VE? 00 SystemTemperature Q330HR-GFE 2010/05/20 Present VK? 00 VCOValue Q330HR-GFE 2010/05/20 Present VC? 00 Battery Voltage Q4120 2010/05/20 Present AE? Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes) Q4120 2002/03/30 Present BQ?,LQ?,UQ?,VQ? ElectroMagnetics Inc. BF4 Magnetometer Q4120 2002/03/09 Present BT?,LT?,UT?,VT? Internal Temperature Q4120 2010/05/20 Present AK? The SAO site also is home to a continuously operating GPS receiver (SAOB) as part of the BARD network. SAO is also the site of electro-magnetic observations.
- Network:
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BK (Berkeley Digital Seismic Network)
- Noise Characteristics:
- Network PDF Noise Analysis Plots
- Data Availability:
- BDSN waveforms and associated metadata are available at the
Northern California Earthquake Data Center (NCEDC).
- Map of BDSN stations
- Table of BDSN stations
- BK Information Directory, including
- List of station locations
- List of available channels
- Instrument Response
- Information on Quanterra Timing Errors
- Information on Quanterra 4120 FIR Filter changes - 6/30/2003
- Information on BH sampling rate change - 06/15/2004
- View digital seismograms
Several tools provide access to SEED format data at the NCEDC, both in terms of querying the archives and allowing data requests.- Querying the archives
- Requesting data by channel and time
- Requesting data by event
Help on using these tools is available.
