Map
of California & Nevada earthquakes
BRK - Haviland Hall, Berkeley, CA, USA
Haviland Hall, UC Berkeley |
1996/08/16 00:00:00 - Present
Latitude: 37.8735
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Typical STS-2 installation |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
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BRK is located on the campus of UC Berkeley
in Haviland Hall.
Over the years, recording at 4 separate sites on campus have used
the station name BRK - the Student Observatory (beginning in 1887),
Bacon Hall, Doe Library, Haviland Hall, and McCone Hall.
BRK was one of the original sites for the Wood-Anderson seismographs deployed in 1930. The Wood-Andersons were operated at this site until they were relocated to BKS in 1962.
- Geology:
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Jurassic/Cretaceous Franciscan sandstone
- Vault/Borehole conditions:
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The instruments are sited in the sub-basement of
Haviland Hall
(a 2-story building) on the UC Berkeley
campus. The piers were constructed when the building was built
and were used over a number of years for various seismic
instruments. In 1962, the Byerly vault was constructed and most of the
critical instrumentation was relocated to BKS. The
Seismological Laboratory decided to re-occupy the
BRK site in 1994, in order to record data for
comparison with historical paper records.
This site is in an occupied building and is frequently noisy (particularly at high frequencies) during working hours. Although data acquisition began in 1994, only selected events were saved. Archiving of the data as a BDSN site began on 8/16/1996.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q935 2001/06/01 Present LE?,UE? Internal Temperature Q935 2001/06/01 Present UK? Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g) Q935 1996/08/16 Present LL?,BL?,HL? Streckeisen STS-2 VBB Tri-Axial Seismometer Q935 1996/08/16 Present UH?,VH?,LH?,BH?,HH? Streckeisen STS-2 VBB Tri-Axial Seismometer Q935 2001/06/01 Present UM? - 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 BRK.
- 06/16/2004: BH channels sampling rate changed from 20 Hz to 40 Hz.
- 12/21/1999: Q960 software upgraded to MSHEAR. Clock changed from GPS1 to GPS2.
- 12/02/1998: GOES clock changed to Quanterra GPS1 clock.
- 08/16/1996: Initiation of full BDSN archive.
- 07/05/1994: Kinemetrics FBA-23 installed.
- 03/08/1994: Streckeisen STS-2 installed with Quanterra Q680 Datalogger.
- Noise Characteristics:
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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