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BDM - Black Diamond Mines Park, Antioch, CA, USA
- 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:
-
Sand
- Vault/Borehole conditions:
-
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:
-
| 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:
-
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:
-
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 |
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 |
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- 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: Wed Jun 25 13:34:08 PDT 2008
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