YBH - Yreka Blue Horn Mine, Yreka, 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 YBH (YBH2)
In Operation 1993/07/24 01:03:00 - Present
Latitude
Longitude:
Elevation: 1059.7 meters
Instrumentation Broadband
GPS

Location

Site 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.

Network

Geology

Metavolcanics

Borehole Conditions

The 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 Description

Reinforced concrete monument

Seismic Station Pictures

Entrance to YBH adit

Entrance to YBH adit

Typical STS-1 installation replaced by STS-7

Typical STS-1 installation replaced by STS-7

GPS Station Timeseries

GPS Station Pictures

YBH2

YBH2

Table of Seismic Instrumentation

SensorDataloggerSEED ChannelsLocation
BroadbandStreckeisen STS-7 VBB Tri-Axial SeismometerQ330HRBH?,HH?,LH?,VH?00
Streckeisen STS-2.5 VBB Tri-Axial SeismometerQ330HRBH?,HH?,LH?,VH?50
AccelerometerKinemetrics FBA ES-T Accel. USGS (4 g max 5 v/g)Q330HRHN?00
AuxiliaryAntennaCurrentQ330HRVE?00
ClockPhaseQ330HRLC?,VC?00
ClockQualityQ330HRLC?,VC?00
InputVoltageQ330HRVE?00
SystemCurrentQ330HRVE?00
SystemTemperatureQ330HRVK?00
VCOValueQ330HRVC?00
CalibrationInputQ330HRLC?EP
HumidityQ330HRLI?EP
PressureQ330HRLD?EP
Setra Systems Model 270 BarometerQ330HRLD?EP
TemperatureQ330HRLK?EP

GPS Instrumentation

ReceiverAntennaRadome-
GPSSeptentrio PolaRx5SEPCHOKE_B3E6 SPKE-

Waveforms and associated metadata, and GPS data, are available at the Northern California Earthquake Data Center (NCEDC).

Waveform Data



GPS Data

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.

Previous Year
YBH2 completeness last year
Lifetime
YBH2 completeness lifetime

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.

Previous Year
YBH2 multipath last year
Lifetime
YBH2 multipath lifetime

Signal-to-Noise Ratio

The Signal-to-Noise ratios are the mean values above the QC elevation mask for L1 and L2 respectively.

Previous Year
YBH2 SNR last year
Lifetime
YBH2 SNR lifetime