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Aerial photograph of Jasper Ridge Courtesy of the JRBP

1994/06/30 21:20:00 - Present Latitude: 37.4037 Longitude: -122.2387 Elevation: 70.50 meters

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
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).

• Map of BDSN stations
• Table of BDSN stations
• BK Information Directory, including
  • List of station locations
  • List of available channels
    • Year/month/day format
    • Year,doy format
  • Instrument Response
    • SEED format
    • Simplified Responses
• 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
  • SeismiQuery at the NCEDC
  • NetDC Request Form
• Requesting data
  • NetDC Request Form

Help on using these tools is available.