YBH - Yreka Blue Horn Mine
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||YBH (YBH2)|
|In Operation||1993/07/24 01:03:00 - Present|
LocationSite is located in the Klamath National Forest.
YBH is an auxiliary station used by the Preparatory Commission for the Comprehensive Test Ban Treaty Organization. The STS-2 installed in 2002 supports CTBTO activities.
NetworkBerkeley Digital Seismic Network (BK)
Bay Area Regional Deformation Network Network (BARD)
Borehole ConditionsThe sensors are located in an abandoned mining adit, approximately 115' from the entrance, on a poured concrete pier. Approximately 75 meters of overburden cover the adit. The seismometers are thermally insulated with 2" of polyurethane foam. The datalogger and supporting equipment are located approximately 50' from the entrance to the adit.
GPS Monument DescriptionReinforced concrete monument
Table of Seismic Instrumentation
|Broadband||Streckeisen STS-7 VBB Tri-Axial Seismometer||Q330HR||BH?,HH?,LH?,VH?||00|
|Streckeisen STS-2.5 VBB Tri-Axial Seismometer||Q330HR||BH?,HH?,LH?,VH?||50|
|Accelerometer||Kinemetrics FBA ES-T Accel. USGS (4 g max 5 v/g)||Q330HR||HN?||00|
|Setra Systems Model 270 Barometer||Q330HR||LD?||EP|
|GPS||SEPTENTRIO POLARX5||SEPTENTRIO SEPCHOKE_B3E6||SPKE||-|
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.