Map
of California & Nevada earthquakes
BDM - Black Diamond Mines Park, Antioch, CA, USA
Black Diamond Mines Regional Park |
1998/11/12 00:00:00 - Present
Latitude: 37.9540
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View of equipment rack at BDM |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
-
Site is located south of Antioch, California, in a former lignite and
sand mine in the Black
Diamond Mines Regional Park, under the auspices of the
East Bay Regional Park District.
- Geology:
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Sand
- Vault/Borehole conditions:
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The instruments are sited approximately 150 meters into an old mine tunnel.
There is a ~100 meter overburden composed of sandstone, shale, and coal,
which limits thermal fluctuations. In addition, 7 centimeters of foam
cover the instruments.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q4120 2003/06/30 Present UE?,LE? Internal Temperature Q4120 2003/06/30 Present UK? Kinemetrics FBA ES-T Accel. (2 g max 10 v/g) Q4120 1998/11/12 1998/12/03 HL?,LL?,BL? Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g) Q4120 1998/12/03 Present BL?,LL?,HL? Motorola MPX201 Pressure Q4120 1998/11/12 Present LD? Streckeisen STS-2 VBB Tri-Axial Seismometer Q4120 1998/11/12 Present BH?,HH?,LH?,UH?,VH? Streckeisen STS-2 VBB Tri-Axial Seismometer Q4120 2003/06/30 Present UM? YSI 44031 Thermistor Q4120 1998/11/12 Present LK? - Network:
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BK (Berkeley Digital Seismic Network)
- Operation Notes: (may not be current)
- This section summarizes major changes in equipment or in instrumentation at BDM.
- 06/15/2004 BH channel sampling rate changed from 20 Hz to 40 Hz.
- 08/20/2003 Q4120 upgraded with signal/power cable and mass position signal.
- 07/01/2003 Upgraded Q4120 configuration to have causal filter at 100 Hz.
- 09/28/2001 Power system replaced.
- 08/15/2001 We are experiencing power problems at this site and intend to replace the power system. In the mean time, data may contain gaps due to power loss at the site.
- 08/25/2000 Telecommunications problem (due to work at Park) fixed. Telemetry resumed.
- 08/08/2000 Q4120 datalogger reinstalled.
- 05/17/2000 Q4120 datalogger removed, due to failure of digitizer board.
- 12/29/1999 New MSHEAR software installed, to change filters from causal to acausal.
- 12/03/1999 New Q4120 installed (actually, the repaired original) with MSHEAR software.
- 09/30/1999 Q4120 datalogger replaced with new Q4120, due to digitizer failure.
- 12/03/1998 FBA-23 accelerometer installed, replacing FBA-ES-T.
- 11/24/1998 Data from BDM archived from this date.
- 11/12/1998 STS-2 and FBA-ES-T installed with Quanterra Q4120 datalogger.
- Noise Characteristics:
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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
Help on using these tools is available.
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Berkeley Seismological Lab
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Copyright 1995-2005, The Regents of the University of California.
Last modified: Wed Jun 25 13:34:08 PDT 2008