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CMB - Columbia College, Columbia, CA, USA

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Site of CMB vault

Site of CMB vault

1986/10/25 00:00:00 - Present

Latitude: 38.0345
Longitude: -120.3865
Elevation: 697.00 meters

STS-1 installation at CMB

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:
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:
SensorDataloggerStart DateEnd DateSEED ChannelsLocation
AntennaCurrentQ330HR-GFE2010/12/17PresentVE?00
ClockPhaseQ330HR-GFE2010/12/17PresentLC?,VC?00
ClockQualityQ330HR-GFE2010/12/17PresentLC?,VC?00
InputVoltageQ330HR-GFE2010/12/17PresentVE?00
Kinemetrics FBA ES-T Accel. GFE (2 g max 10 v/g)Q330HR-GFE2010/12/17PresentHN?00
Streckeisen STS-1/E300 VBB Feedback SeismometerQ330HR-GFE2010/12/17PresentBH?,HH?,LH?,VH?00
SystemCurrentQ330HR-GFE2010/12/17PresentVE?00
SystemTemperatureQ330HR-GFE2010/12/17PresentVK?00
VCOValueQ330HR-GFE2010/12/17PresentVC?00

Previous Instrumentation

The CMB site also is home to a continuously operating GPS receiver (CMBB) as part of the BARD network.

Network:
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).

Several tools provide access to SEED format data at the NCEDC, both in terms of querying the archives and allowing data requests.

Help on using these tools is available.

BDSN Overview | Map | Table