B.K. INFORMATION CONNECTIONS (1996) LTD.

CMB - Columbia College, Columbia, CA, USA 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 Site is located on the campus of in Sonora, California. This site was established to relocate instrumentation from the in Jamestown. CMB was upgraded with partial funding from the and data are archived at the IRIS Data Management Center as well as the NCEDC. CMB is also a cooperative station with the . Paleozoic marine limestone 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. Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q935 06/01/2001 Present LE?, UE? Guralp CMG-3 Extended BB H Seismometer DWSSN 03/17/1989 06/25/1992 BH?, LH? Guralp CMG-3 Extended BB V Seismometer DWSSN 03/17/1989 06/25/1992 BH?, LH? Internal Temperature Q935 06/01/2001 Present UK? Kinemetrics FBA-23 Triaxial Accelerometer (2 g max 1.25 v/g) Q935 06/25/1992 Present BL?, H...