Map
of California & Nevada earthquakes
SCCB - Santa Clara Co. Comm. Cntr., Santa Clara, CA, USA
View of SCCB container |
2000/04/28 11:17:00 - Present
Latitude: 37.2874
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View of SCCB vault |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
-
The SCCB site is located at the
Santa Clara County
communications facility in south San Jose.
This site is centrally located within the Santa Clara valley on a
serpentine and Franciscan outcrop. Emergency response dispatchers
and personnel are at the site around the clock. Power at the site
is backed up by uninterruptible power supplies and diesel generators.
This is also the location of the BARD station
LUTZ.
SCCB is one of currently two BDSN sites that consisting of a strong-motion sensor and Q730 datalogger. The HFN station RFSB has a surface strong-motion sensor and Q730 datalogger in addition to the borehole installation.
- Geology:
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Franciscan
- Vault/Borehole conditions:
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Construction at the site was limited to trenching
from an existing concrete radio and microwave vault
to a rock outcrop situated 100 meters from the building. By
locating the seismometer outside the concrete building,
free-field interference was minimized. A concrete pad was
poured to level the seismometer at that location. A double
shielded cable was used to connect the seismometer to the
datalogger, in order to minimize RF pickup from the nearby
emergency transmission equipment. Ferrite beads were added
to the cable to further reject unwanted RF which could couple
into the cable.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q730 2001/06/01 Present LE?,UE? Kinemetrics FBA ES-T Accel. (2 g max 10 v/g) Q730 2000/04/28 2006/10/19 BL?,LL?,HL? TSA-100S (4 g max 5 v/g) Q730 2006/10/19 Present BL?,LL?,HL? - 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 SCCB.
- 09/05/2001: Episensor replaced.
- 09/13/2000: Episensor and Q730 relocated to external pier.
- 04/27/2000: Episensor and Q730 installed in SCC communications building.
- 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 
- 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