HELL - Private Property, Miramonte, CA, USA
We operate broadband and borehole stations under the network code BK. The Berkeley Digital Seismic Network (BDSN) is a regional network of very broadband and strong motion seismic stations designed to monitor regional seismic activity as well as provide high quality data. The Berkeley borehole stations have borehole geophones or other seismic sensors and may have other geophysical instrumentation.
BARD is our GPS network for monitoring crustal deformation across the Pacific-North America plate boundary and in the San Francisco Bay Area for earthquake hazard reduction studies and rapid earthquake emergency response assessment
|Station Name||HELL (HELP)|
|In Operation||2005/04/09 00:00:00 - Present|
LocationSite is located on private property in the Sierra Nevada foothills east of Fresno, CA.
This station was installed in March 2005 by USArray personnel as a collaboration with the Berkeley Seismological Laboratory, and was part of the USArray component of the Earthscope program. When the Travelling Array left California in 2007, the BSL adopted this station. It has been operating as a BDSN station since March 2008.
NetworkBerkeley Digital Seismic Network (BK)
Bay Area Regional Deformation Network Network (BARD)
Mesozoic granite, quartz monzonite, granodiorite, and quartz
Borehole ConditionsThe HELL installation is based on the USArray vault design.
GPS Monument DescriptionReinforced concrete pillar monument. HELP replaced retired GPS site HELB.
Seismic Station Pictures
The vault at HELL. (Photo: H. Rademacher)
- 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
View of the dome at HELP
Table of Seismic Instrumentation
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.
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.
The Signal-to-Noise ratios are the mean values above the QC elevation mask for L1 and L2 respectively.