GASB - Alder Springs, CA, USA
| Station Name | GASB (GASB) |
| In Operation | 2005/09/22 00:00:00 - Present |
| Latitude | |
| Longitude: | |
| Elevation: | 1354.80 meters |
| Instrumentation | Broadband GPS |
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Site
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.
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.
Network
BK, BARD (Berkeley Digital Seismic Network and Bay Area Regional Deformation 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.GPS Monument Description
Post fixed into the concrete that surrounds seismic vault. Post is reinforced by a concrete cylinder and three welded legs. The ends of the three legs were driven into the ground and filled in with cement. -
Plots & Figures
Seismic Station Pictures
Construction at GASB
GASB vault under construction
GPS Station Timeseries
- Time series processing at the BSL
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Last year Clean Clean & detrended Raw Raw & detrended Lifetime Clean Clean & detrended Raw Raw & detrended Text file (final results only) Clean Raw
GPS Station Pictures
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Instrumentation
Table of Seismic Instrumentation
Sensor Datalogger SEED Channels Location Broadband Streckeisen STS-2 VBB Tri-Axial Seismometer Q330HR-GFE BH?,HH?,LH?,VH? 00 Accelerometer Kinemetrics FBA ES-T Accel. (2 g max 10 v/g) Q330HR-GFE HN? 00 Receiver Antenna Radome - GPS TopCon Net-G3A TopCon Choke-ring SCIGN Tall - Sensor Datalogger SEED Channels Location Auxiliary AntennaCurrent Q330HR-GFE VE? 00 ClockPhase Q330HR-GFE LC?,VC? 00 ClockQuality Q330HR-GFE LC?,VC? 00 InputVoltage Q330HR-GFE VE? 00 SystemCurrent Q330HR-GFE VE? 00 SystemTemperature Q330HR-GFE VK? 00 VCOValue Q330HR-GFE VC? 00 -
Data & Metadata
Waveforms and associated metadata, and GPS data, are available at the Northern California Earthquake Data Center (NCEDC).
Waveform Data
- BK Information Directory, including
- List of station locations
- List of available channels
- Instrument Response
- Querying the archives
- Download waveform data
GPS Data
- Site log: gasb.log
Data Type From To Low-rate raw --- --- Low-rate rinex 6/17/2011 present High-rate raw 6/17/2011 present High-rate rinex 6/17/2011 present
- BK Information Directory, including
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Data Quality
Noise Analysis
View more noise plots
GPS Data Quality
Completeness
Data completeness is defined both as "Completeness of observations" and "Cycle slips per observation". "Completeness of Obs." is the number of epochs in the final RINEX file normalized to the expected number. This percentage will go down if time is missing from the RINEX file. "Cycle slips per Obs." is the total number of detected cycle slip normalized to the total number of observations in the RINEX file. This number will increase as the receiver loses lock on satellites more frequently.
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Multipath
The effects of multipath on the data are estimated by parameters for L1 and L2 (MP1 and MP2 respectively); see Estey and Meertens (GPS Solutions, 1999) for derivation. The daily value is the RMS of MP1 and MP2 throughout the day and for all satellites. Higher values indicate a greater prevalence and/or strength of multipathing, i.e. objects on the ground are providing multiple reflection pathways from the satellite to antenna.
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