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BRK - Haviland Hall, Berkeley, CA, USA

Haviland Hall, UC Berkeley

Haviland Hall, UC Berkeley

1996/08/16 00:00:00 - Present

Latitude: 37.8735
Longitude: -122.2610
Elevation: 49.40 meters

Typical STS-2 installation

Typical STS-2 installation

Location | Geology | Vault Conditions
Instrumentation | Network | Operation Notes
Noise Characteristics | Data Availability

Location:
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:
Jurassic/Cretaceous Franciscan sandstone

Vault/Borehole conditions:
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:
SensorDataloggerStart DateEnd DateSEED ChannelsLocation
Battery VoltageQ9352001/06/01PresentLE?,UE?
Internal TemperatureQ9352001/06/01PresentUK?
Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g)Q9351996/08/16PresentLL?,BL?,HL?
Streckeisen STS-2 VBB Tri-Axial SeismometerQ9351996/08/16PresentUH?,VH?,LH?,BH?,HH?
Streckeisen STS-2 VBB Tri-Axial SeismometerQ9352001/06/01PresentUM?

Network:
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:
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
1999 PSD 2000 PSD 2001 PSD 2002 PSD 2003 PSD 2004 PSD 2005 PSD

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



Berkeley Seismological Lab
215 McCone Hall, UC Berkeley
Berkeley CA 94720-4760
www@seismo.berkeley.edu

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Last modified: Wed Jun 25 13:34:08 PDT 2008