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CMB - Columbia College, Columbia, CA, USA |
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Site of CMB vault |
1986/10/25 00:00:00 - Present
Latitude: 38.0345
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STS-1 installation at CMB |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Noise Characteristics |
Data Availability
- Location:
-
Site is located on the campus of
Columbia College
in Sonora, California. This site was established to relocate
instrumentation from the JAS1 in Jamestown.
CMB was upgraded with partial funding from the IRIS Consortium and data are archived at the IRIS Data Management Center as well as the NCEDC. CMB is also a cooperative station with the Advanced National Seismic System.
- Geology:
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Paleozoic marine limestone
- Vault/Borehole conditions:
-
The vault is a buried fiberglass cylinder,
eight feet in diameter and
six feet deep. It has a flat top at grade
level with a hatch for entry. The floor
is concrete poured directly on rock.
The datalogger and supporting
equipment are located in an air
conditioned trailer located about 70
feet from the vault and connected via
underground conduits. The
seismometers are thermally
insulated with 4" of polyurethane
foam and the top of the vault is
covered with bark for additional
insulation.
- Instrumentation:
-
Sensor Datalogger Start Date End Date SEED Channels Location AntennaCurrent Q330HR-GFE 2010/12/17 Present VE? 00 ClockPhase Q330HR-GFE 2010/12/17 Present LC?,VC? 00 ClockQuality Q330HR-GFE 2010/12/17 Present LC?,VC? 00 InputVoltage Q330HR-GFE 2010/12/17 Present VE? 00 Kinemetrics FBA ES-T Accel. GFE (2 g max 10 v/g) Q330HR-GFE 2010/12/17 Present HN? 00 Streckeisen STS-1/E300 VBB Feedback Seismometer Q330HR-GFE 2010/12/17 Present BH?,HH?,LH?,VH? 00 SystemCurrent Q330HR-GFE 2010/12/17 Present VE? 00 SystemTemperature Q330HR-GFE 2010/12/17 Present VK? 00 VCOValue Q330HR-GFE 2010/12/17 Present VC? 00 The CMB site also is home to a continuously operating GPS receiver (CMBB) as part of the BARD network.
- Network:
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BK (Berkeley Digital Seismic Network)
- Noise Characteristics:
- Network PDF Noise Analysis Plots
- 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 by channel and time
- Requesting data by event
Help on using these tools is available.
