Map
of California & Nevada earthquakes
YBH - Yreka Blue Horn Mine, Yreka, CA, USA
Entrance to YBH adit |
1993/07/24 01:03:00 - Present
Latitude: 41.7320
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Typical STS-1 installation |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
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Site is located in the Klamath
National Forest.
YBH is an auxillary station used by the Prepatory Commission for the Comprehensive Test Ban Treaty Organization. The STS-2 installed in 2002 supports CTBTO activities.
- Geology:
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Metavolcanics
- Vault/Borehole conditions:
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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.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q935 06/01/2001 Present LE?,UE? Druck PTX-1240 Barometric Sensor Q935 11/01/2002 Present LD? Internal Temperature Q935 06/01/2001 Present UK? Kinemetrics FBA-23 Triaxial Accelerometer (2 g max 1.25 v/g) Q935 07/24/1993 Present BL?,HL?,LL? Motorola MPX201 Pressure Q935 05/17/1996 Present LD? Streckeisen STS-1 VBB Feedback Seismometer Q935 07/24/1993 Present BH?,HH?,LH?,UH?,UM?,VH? Streckeisen STS-2 VBB Tri-Axial Seismometer Q935 05/17/1996 10/21/1996 BH?,BH?,HH?,HH?,LH?,LH?,UH?,UH?,UM?,VH?,VH? YSI 44031 Thermistor Q935 05/17/1996 Present LK? The YBH site also is home to a continuously operating GPS receiver (YHBB) as part of the BARD network.
- Network:
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BK (Berkeley Digital Seismic Network)
- Operation Notes: (may not be current)
- This section summarizes major changes in equipment or in instrumentation at YBH.
- 06/15/2004: Changed BH channels sampling rate to 40 Hz.
- 10/31/2002: Install CNTBTO STS-2.
- 05/28/2002: Installed Druck barometer system.
- 12/1999: MSHEAR installed to replace USHEAR software.
- 10/21/1996: The STS-1 instrument was re-installed.
- 05/17/1996: The STS-1 instrument was replaced with an STS-2 temporarily, in order to fix a problem in the vertical component of the STS-1.
- 05/13/1996: Frame-relay circuit installed. Termperature/pressure package installed.
- 07/24/1993: A Streckeisen STS-1 and a Kinemetrics FBA-23 were installed with a Quanterra Q980 digitizer.
- Noise Characteristics:
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The figures below are cumulative plots of power spectral density (psd)
determined from the broadband channels. In each figure, the vertical
component psd is plotted with blue diamonds, the north component
psd with red squares, and the east component psd with green circles.
The results are presented in the 5 different frequency bands, and
the USGS/Albuquerque low noise model is plotted as a dashed line in each.
The PSD units are in dB (decibel) relative to 1 (m/s**2)**2/Hz. The current
annual plot is updated weekly.
Cumulative PSD results 1999 2000 2001 2002 2003 2004 2005 
- Data Availability:
- BDSN waveforms and associated metadata are available at the
Northern California Earthquake Data Center (NCEDC).
- Map of BDSN stations
- Table of BDSN stations
- BK Information Directory, including
- List of station locations
- List of available channels
- Instrument Response
- Information on Quanterra Timing Errors
- Information on Quanterra 4120 FIR Filter changes - 6/30/2003
- Information on BH sampling rate change - 06/15/2004
- View digital seismograms
Several tools provide access to SEED format data at the NCEDC, both in terms of querying the archives and allowing data requests.- Querying the archives
- Requesting data
Help on using these tools is available.
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Berkeley Seismological Lab
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Copyright 1995-2005, The Regents of the University of California.
Last modified: Mon Jan 14 12:14:23 PST 2008