MHC - Lick Observatory, Mt. Hamiliton, CA, USA
|Station Name||MHC (MHCB)|
|In Operation||1986/09/10 00:00:00 - Present|
LocationSite is located at the Lick Observatory atop Mount Hamilton, and is under the auspices of UC Santa Cruz. The site was first established in 1887 with the installation of the first seismic sensors in North America, and has been occupied continuously since then. Wood-Anderson seismographs were deployed at this site in 1928 and operated until 1993. The first digital broadband instrumentation was deployed in 1987.
NetworkBK, BARD (Berkeley Digital Seismic Network and Bay Area Regional Deformation Network)
GeologyJurassic-Cretaceous Franciscan greywacke and greenstone
Vault/Borehole ConditionsThe vault is located in a room in the east wing of the Lick Observatory. The piers are reinforced concrete which are isolated from the building. The seismometer room is isolated from the hallway via two doors and the datalogger and supporting equipment are in an adjacent room. The seismometers are thermally insulated with 4" of polyurethane foam.
Plots & Figures
View of the dome at MHC
Typical STS-1 installation
- Time series processing at the BSL
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
Table of Seismic Instrumentation
Sensor Datalogger SEED Channels Location Broadband Streckeisen STS-1 VBB Feedback 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 Trimble NetRS Ashtech Choke-Ring SCIGN Short - 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).
- BK Information Directory, including
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.
Previous Year Lifetime
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.
Previous Year Lifetime