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JRSC - Jasper Ridge Biol. Preserve, Stanford, CA, USA
- 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 |
| AntennaCurrent | Q330 | 2004/12/29 | Present | VE?,VE? | 10 |
| BF7 | Q330 | 2004/12/29 | Present | LT?,BT? | 20 |
| BF7 | Q330 | 2005/06/03 | Present | VT? | 20 |
| Battery Voltage | Q680 | 2001/06/01 | Present | LE?,UE? | |
| ClockPhase | Q330 | 2004/12/29 | Present | LC?,LC? | 20 |
| ClockQuality | Q330 | 2004/12/29 | Present | LC?,LC? | 20 |
| Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes) | Q330 | 2004/12/29 | Present | BQ?,LQ? | 10 |
| Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes) | Q330 | 2005/06/03 | Present | VQ? | 10 |
| ElectroMagnetics Inc. BF4 Magnetometer | Q330 | 2004/12/29 | Present | BT?,LT? | 20 |
| ElectroMagnetics Inc. BF4 Magnetometer | Q330 | 2005/06/03 | Present | VT? | 20 |
| InputVoltage | Q330 | 2004/12/29 | Present | VE?,VE? | 20 |
| Internal Temperature | Q680 | 2001/06/01 | Present | UK? | |
| Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g) | Q680 | 1994/06/30 | 2008/04/25 | BL?,HL?,LL? | |
| Streckeisen STS-2 VBB Tri-Axial Seismometer | Q680 | 1994/06/30 | Present | VH?,UH?,HH?,BH?,LH? | |
| Streckeisen STS-2 VBB Tri-Axial Seismometer | Q680 | 2001/06/01 | Present | UM? | |
| SystemCurrent | Q330 | 2004/12/29 | Present | VE?,VE? | 20 |
| SystemTemperature | Q330 | 2004/12/29 | Present | VK?,VK? | 20 |
| SystemTemperature | Q330 | 2005/06/03 | Present | VP?,VP? | 10 |
| TSA-100S (4 g max 5 v/g) | Q680 | 2008/04/25 | Present | LL?,HL?,BL? | |
| VCOValue | Q330 | 2004/12/29 | Present | VC?,VC? | 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).
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
Help on using these
tools is available.
Copyright 1995-2005, The Regents of the University of California.
Last modified: Tue Dec 2 11:59:55 PST 2008
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