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 (YBHB)
In Operation 1993/07/24 01:03:00 - Present
Elevation: 1059.7 meters
Instrumentation Broadband


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.




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

Typical STS-1 installation

GPS Station Timeseries

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

SensorDataloggerSEED ChannelsLocation
BroadbandStreckeisen STS-1/E300 VBB Feedback Horizontal SeismometerQ330HR-GFEBH?,HH?,LH?,VH?00
Streckeisen STS-1/E300 VBB Feedback Vertical SeismometerQ330HR-GFEBH?,HH?,LH?,VH?00
Streckeisen STS-2.5 VBB Tri-Axial SeismometerQ330BH?,HH?,LH?,VH?50
AccelerometerKinemetrics FBA ES-T Accel. (4 g max 5 v/g)Q330HR-GFEHN?00
GPSTopcon Net-G3AAshtech Choke-RingSCIGN Tall-
SensorDataloggerSEED ChannelsLocation

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


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
YBHB completeness last year
YBHB completeness 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
YBHB multipath last year
YBHB multipath lifetime