Map
of California & Nevada earthquakes
PKD - Bear Valley Ranch, Parkfield, CA, USA
View of Parkfield |
1996/09/06 16:28:00 - Present
Latitude: 35.9452
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Typical STS-2 installation |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
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Site is located in Parkfield,
California, at the Bear Valley Ranch. This site was
selected as a replacement for
PKD1.
- Geology:
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Miocene non-marine
- Vault/Borehole conditions:
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The instrumentation is sited on a
pier in a shallow adit built with a
steel container.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q4120 2003/09/12 Present AE? Battery Voltage Q935 2001/06/01 Present UE?,LE? Electric Field Dipole (Pb-PbCl or Cu-CuS Anodes) Q4120 1999/02/05 Present BQ?,LQ?,VQ?,UQ? ElectroMagnetics Inc. BF4 Magnetometer Q4120 1999/02/05 Present LT?,VT?,UT?,BT? Internal Temperature Q4120 2003/09/12 Present AK? Internal Temperature Q935 2001/06/01 Present UK? Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g) Q935 1996/09/06 Present LL?,BL?,HL? Motorola MPX201 Pressure Q935 1996/09/06 Present LD? Streckeisen STS-2 VBB Tri-Axial Seismometer Q935 1996/09/06 Present LH?,VH?,HH?,BH?,UH? Streckeisen STS-2 VBB Tri-Axial Seismometer Q935 2001/06/01 Present UM? YSI 44031 Thermistor Q935 1996/09/06 Present LK? The PKD site also is home to a continuously operating GPS receiver (PKDB) as part of the BARD network. PKD is also the site of electro-magnetic observations.
- 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 PKD.
This site suffers from frequent communications problems, owing to rich radio environment in the Parkfield area and issues with line of sight limitations. Over the years, we have experimented with mulitple radios and various options for repeaters.- 06/15/2004: Changed BH channels sampling rate to 40 Hz.
- 10/10/2001: STS-2 seismometer replaced.
- 12/20/1999: Q980 software upgraded to MSHEAR.
- 02/05/1999: Installed electro-magnetic sensors, with a Quanterra 4120
- 05/09/1997: Upgraded Q980 with 4 GB disk and ethernet card.
- 09/20/1996: Installed GPS monument and Ashtech receiver.
- 08/13/1996: Streckeisen STS-2 broadband seismometer and Kinemetrics FBA-23 installed.
- Noise Characteristics:
-
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: Tue Dec 2 11:59:55 PST 2008