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GASB - Alder Springs, CA, USA
- Location:
-
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:
-
TBD
- Vault/Borehole conditions:
-
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:
-
| 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:
-
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:
-
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 |
 |
 |
 |
 |
 |
 |
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- 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.
- Querying the archives
- Requesting data
Help on using these
tools is available.
Copyright 1995-2005, The Regents of the University of California.
Last modified: Wed Jun 25 13:34:08 PDT 2008
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