MHDL - Marin Headlands, GG Nat'l Rec. Area, CA, USA
|Station Name||MHDL (MHDL)|
|In Operation||2006/05/17 23:00:00 - Present|
LocationMHDL is located in the Marin Headlands of the Golden Gate National Recreation Area and was installed under the auspices of the National Park Service. This site is known as SFMAR in the USGS Low Frequency Network.
Although the installation is not complete as far as the data acquisition using the Quanterra datalogger, the USGS satellite system is installed and operational.
NetworkBK, UL, BARD (Mini PBO Network, USGS Low Frequency Network, and Bay Area Regional Deformation Network)
Vault/Borehole ConditionsThe MiniPBO borehole was installed on 08/06/2002. The strainmeter was installed at 520.6 ft and the seismometer package at 489.2 ft depth. This figure shows the location of equipment in the borehole.
Plots & Figures
View from the Marin Headlands
Installation of strainmeter at MHDL
Courtesy of the USGS
- 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 Geophone Mark Products L-22 Horizontal Geophone BASALT8X EP?,LP?,SP? 40 Mark Products L-22 Vertical Geophone BASALT8X EP?,LP?,SP? 40 Receiver Antenna Radome - GPS Trimble NetRS Ashtech Choke-ring SCIGN Short - Sensor Datalogger SEED Channels Location Others BF7 Q330 BT?,LT?,VT? 20 ElectroMagnetics Inc. BF4 Magnetometer Q330 BT?,LT?,VT? 20 Sacks 3-component Tensor Strainmeter BASALT8X BS?,HS?,LS? 40 Setra Systems Model 270 Barometer BASALT8X LD? 40 Auxiliary AntennaCurrent Q330 VE? 20 VCOValue Q330 VC? 20 CPULoadAverage BASALT8X LC? 40 ClockPhase BASALT8X LC? 40 ClockQuality BASALT8X LC? 40 DataStorageUsed BASALT8X LC? 40 InputVoltage BASALT8X LE? 40 SystemCurrent BASALT8X LE? 40 SystemHumidity BASALT8X LI? 40 SystemTemperature BASALT8X LK? 40 TXCOValue BASALT8X LC? 40
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