Map
of California & Nevada earthquakes
HOPS - Hopland Field Station, Hopland, CA, USA
Installation of HOPS STS-1 |
1994/10/21 02:23:00 - Present
Latitude: 38.9935
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STS-1s at HOPS |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
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HOPS is located at the Hopland
Research and Extension Center of the
University of California Agriculture
and Natural Resources unit, under the auspices of
UC Davis.
- Geology:
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Franciscan Formation
- Vault/Borehole conditions:
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The instruments are located in a steel and
concrete vault benched into a hillside with 2
meters of soil overburden. The vault is oriented
north/south to minimize the effects of solar
heating. The concrete pier is covered with 4" of
insulation on the sides and 8" of insulation on
the top. The datalogger and supporting
equipment are in an adjacent room.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q935 2001/06/01 Present UE?,LE? Internal Temperature Q935 2001/06/01 Present UK? Kinemetrics FBA-23 Accel. (2 g max 1.25 v/g) Q935 1994/10/21 Present LL?,BL?,HL? Motorola MPX201 Pressure Q935 1997/04/29 Present LD? Streckeisen STS-1 VBB Feedback Seismometer Q935 1994/10/21 Present UH?,BH?,VH?,LH?,HH? Streckeisen STS-1 VBB Feedback Seismometer Q935 2001/06/01 Present UM? YSI 44031 Thermistor Q935 1997/04/29 Present LK? The HOPS site also is home to a continuously operating GPS receiver (HOPB) as part of the BARD network.
- Network:
-
BK (Berkeley Digital Seismic Network)
- Operation Notes: (may not be current)
- This section summarizes major changes in equipment or in instrumentation at HOPS.
- 06/15/2004: Changed BH channel sampling from 20 Hz to 40 Hz.
- 11/01/2001: Refurbished STS-1 near-electronics boxes installed.
- 12/15/1999: Q980 software upgraded to MSHEAR.
- 10/15/1998: Replaced FBA-23.
- 01/08/1998: Upgraded Q980 disk to 4 GB. Replaced NS STS-1. Installed warpless baseplates.
- 04/29/1997: Replaced EW STS-1, due to gain problem identified 04/22/1997. Installed barometer/thermometer package.
- 01/23/1997: Q980 software upgraded to newest version of USHEAR, TCP/IP data acquisition initiated.
- 12/18/1995: Replaced Q980 datalogger. Replaced GOES clock with Quanterra GPS clock. Installed frame-relay communication.
- 08/30/1995: Installed GPS monument and Ashtech receiver
- 10/20/1994: A Streckeisen STS-1 and a Kinemetrics FBA-23 were installed with a Quanterra Q980 Datalogger.
- 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: Wed Jun 25 13:34:08 PDT 2008