Home

News & Updates

Who we are

Research Activities

Geophysical Networks

Map of California & Nevada earthquakes

More Earthquake Information

Education and Outreach

Annual Report

BSL Directory

Site Index

Search

Equipment rack at POTR

1998/12/10 22:18:00 - 2005/02/05 01:29:00 Latitude: 38.2026 Longitude: -121.9353 Elevation: 20.00 meters

Typical STS-2 installation

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

Location:

Site is located in the Potrero Hills area of the Sacramento River Delta near Fairfield, California. The site is a former Nike missile silo and is currently under the stewardship of the Army Corps of Engineers.

Geology:

Eocene Marine

Vault/Borehole conditions:

The instruments are located within one of the Nike missile silos, with

Instrumentation:

Sensor	Datalogger	Start Date	End Date	SEED Channels	Location
Battery Voltage	Q4120	2003/04/09	2005/02/05	UE?,LE?
Kinemetrics FBA ES-T Accel. (2 g max 10 v/g)	Q4120	1998/12/10	2005/02/05	LL?,BL?,HL?
Motorola MPX201 Pressure	Q4120	1998/12/10	2005/02/05	LD?
Streckeisen STS-2 VBB Tri-Axial Seismometer	Q4120	1998/12/10	2005/02/05	HH?,VH?,LH?,UH?,BH?
Streckeisen STS-2 VBB Tri-Axial Seismometer	Q4120	2003/04/09	2005/02/05	UK?,UM?
YSI 44031 Thermistor	Q4120	1998/12/10	2005/02/05	LK?

Network:

BK (Berkeley Digital Seismic Network)

Operation Notes: (may not be current)

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

• 03/06/2000: MSHEAR software upgraded to newer version.
• 12/15/1999: Upgraded Q4120 to MSHEAR software.
• 12/10/1998: Streckeisen STS-2 broadband seismometer and Quanterra Q4120 Datalogger installed. GPS antenna installed.

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.