Map
of California & Nevada earthquakes
GASB - Alder Springs, CA, USA
Construction at GASB |
2005/09/22 00:00:00 - Present
Latitude: 39.6547
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GASB vault under construction |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
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The site is located at Alder Springs, CA, USA.
In addition to the UC Berkeley broadband and strong-motion sensor, this area is home to a short-period sensor operated by the California Department of Water Resources. There is also a nearby weather station
Support for GASB was provided by National Tsunami Hazard Program and the Governor's Office of Emergency Services as part of the California Integrated Seismic Network.
- Geology:
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TBD
- Vault/Borehole conditions:
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The instruments are located in a steel and
concrete vault benched into a gentle hillside and
covered with soil overburden.
The concrete pier is covered with 4" of
insulation on the sides and 8" of insulation on
the top. The datalogger and supporting
equipment are in an adjacent room.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q4120 2005/09/22 Present UE?,LE? Internal Temperature Q4120 2005/09/22 Present UK? Kinemetrics FBA ES-T Accel. (2 g max 10 v/g) Q4120 2005/09/22 Present LL?,HL?,BL? Motorola MPX201 Pressure Q4120 2006/05/10 Present LD? Streckeisen STS-2 VBB Tri-Axial Seismometer Q4120 2005/09/22 Present BH?,HH?,VH?,UH?,LH?,UM? YSI 44031 Thermistor Q4120 2006/05/10 Present LK? - 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 GASB.
- 09/22/2005: Instrumentation installed.
- 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