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JRSC - Jasper Ridge Biol. Preserve, Stanford, CA, USA |
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Aerial photograph of Jasper Ridge |
1994/06/30 21:20:00 - Present
Latitude: 37.4037
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Typical STS-2 installation |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
-
The site is located in the
Jasper Ridge
Biological Preserve in Stanford, California. It is the
replacement installation for the STAN
location and is operated cooperatively
with Stanford University.
- Geology:
-
Serpentine
- Vault/Borehole conditions:
-
The vault is located in an east/west adit, 20' in
length, constructed for the development of Searsville
Dam (circa 1900). The instruments are located in
an aluminum pressure tank on a concrete pier.
Apporoximately 4 meters of overburden cover the adit.
The datalogger and accessory equipment are
located in front of the adit.
- Instrumentation:
-
Sensor Datalogger Start Date End Date SEED Channels Location Streckeisen STS-2 VBB Tri-Axial Seismometer Q330HR-GFE 2010/07/08 Present BH?,HH?,LH?,VH? 00 TSA-100S (4 g max 5 v/g) Q330HR-GFE 2010/07/08 Present HN? 00 AntennaCurrent Q330 2004/12/29 Present VE? 10 ClockPhase Q330 2004/12/29 Present LC? 10 ClockQuality Q330 2004/12/29 Present LC? 10 Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes) Q330 2004/12/29 Present BQ?,LQ? 10 InputVoltage Q330 2004/12/29 Present VE? 10 PacketBufferUsage Q330 2008/04/25 Present VP? 10 SystemCurrent Q330 2004/12/29 Present VE? 10 SystemTemperature Q330 2004/12/29 Present VK? 10 VCOValue Q330 2004/12/29 Present VC? 10 BF7 Q330 2004/12/29 Present BT?,LT? 20 ElectroMagnetics Inc. BF4 Magnetometer Q330 2004/12/29 Present BT?,LT? 20 - Network:
-
BK (Berkeley Digital Seismic Network)
- Operation Notes: (may not be current)
- This section summarizes major changes in equipment or in instrumentation at JRSC.
- 06/15/2004: BH channels sampling rate changed from 20 to 40 Hz.
- 10/17/2003: FBA-23 removed for repair.
- 02/16/2000: STS-2 replaced.
- 12/16/1999: Q680 software upgraded to MSHEAR.
- 03/18/1999: Q680 upgraded with 4 GB disk and ethernet card. GOES clock replaced with Quanterra GPS cl ock.
- 11/02/1995: Switched to frame-relay circuit.
- 06/07/1995: Replaced Q980 with upgraded Q680.
- 04/07/1995: Replaced Q680 with Q980. Q680 sent to Quanterra for upgrade.
- 07/01/1994: A Streckeisen STS-2 and a Kinemetrics FBA-23 were installed with a Quanterra Q680 digitizer.
- Noise Characteristics:
-
The figures below are cumulative plots of power spectral density (psd)
determined from the broadband channels. In each figure, the vertical
component psd is plotted with blue diamonds, the north component
psd with red squares, and the east component psd with green circles.
The results are presented in the 5 different frequency bands, and
the USGS/Albuquerque low noise model is plotted as a dashed line in each.
The PSD units are in dB (decibel) relative to 1 (m/s**2)**2/Hz. The current
annual plot is updated weekly.
Cumulative PSD results 1999 2000 2001 2002 2003 2004 2005 
- 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.
