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View of WDC dome

1992/09/17 19:23:00 - Present Latitude: 40.5799 Longitude: -122.5411 Elevation: 268.30 meters

Typical STS-2 installation

Location | Geology | Vault Conditions
Instrumentation | Network | Operation Notes
Noise Characteristics | Data Availability

Location:

Site is located in the NEED camp of the Whiskeytown-Shasta-Trinity Recreational Area, under the auspices of the US National Park Service.

Geology:

Gneiss

Vault/Borehole conditions:

The sensors are located approximately 150' into a tunnel and encased in a steel tank which is located on a poured concrete pad. Approximately 25 meters of overburden cover the tunnel. The datalogger and supporting equipment is located in an external building and connected via conduits.

Instrumentation:

Sensor	Datalogger	Start Date	End Date	SEED Channels	Location
Battery Voltage	Q935	2001/06/01	Present	UE?,LE?
Internal Temperature	Q935	2001/06/01	Present	UK?
Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g)	Q935	1992/09/17	Present	LL?,BL?,HL?
Motorola MPX201 Pressure	Q935	1996/05/30	Present	LD?
Streckeisen STS-2 VBB Tri-Axial Seismometer	Q935	1992/09/17	Present	UH?,BH?,VH?,LH?,HH?
Streckeisen STS-2 VBB Tri-Axial Seismometer	Q935	2001/06/01	Present	UM?
YSI 44031 Thermistor	Q935	1996/05/30	Present	LK?

Network:

BK (Berkeley Digital Seismic Network)

Operation Notes: (may not be current)

This section summarizes major changes in equipment or in instrumentation at WDC.

• 06/15/2004: Changed BH channels sampling rate to 40 Hz.
• 10/11/1999: Q980 upgraded to MSHEAR software.
• 06/11/1998: Upgraded Q980 with 4 Gb disk and ethernet card.
• 06/01/1996: Installed barometer/thermometer package.
• 02/02/1996: Frame-relay telemetry installed.
• 07/20/1995: Replaced STS-2.
• 02/04/1994: Replaced GOES clock with GPS clock.
• 07/14/1992: A Streckeisen STS-2 and a Kinemetrics FBA-23 were installed with a Quanterra Q980 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.