Map
of California & Nevada earthquakes
MOD - Modoc Plateau, CA, USA
NSN VSAT at MOD |
1999/10/16 00:00:00 - Present
Latitude: 41.9025
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MOD construction |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
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Site is located on private property in Modoc County,
California, approximately 10 kilometers from the
Oregon border and 20 kilometers from the Nevada border.
MOD was established to replace MIN,
which had become increasingly noisy due to traffic on route
36.
MOD is a cooperative station with the US National Seismic Network
- Geology:
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Pyroclastic Rock
- Vault/Borehole conditions:
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The vault is a horizontal tunnel, located beneath
5 meters of overburden to maintain thermal stability.
- Instrumentation:
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Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q935 2001/06/01 Present LE?,UE? Internal Temperature Q935 2001/06/01 Present UK? Kinemetrics FBA ES-T Accel. (2 g max 10 v/g) Q935 1999/10/16 Present LL?,BL?,HL? Motorola MPX201 Pressure Q935 1999/10/16 Present LD? Streckeisen STS-1 VBB Feedback Seismometer Q935 1999/10/16 2006/07/19 BH?,HH?,LH?,UH?,VH? Streckeisen STS-1 VBB Feedback Seismometer Q935 2001/06/01 2006/07/19 UM? Streckeisen STS-2 VBB Tri-Axial Seismometer Q935 2006/07/19 Present LH?,BH?,VH?,HH?,UM?,UH? YSI 44031 Thermistor Q935 1999/10/16 Present LK? The MOD site also is home to a continuously operating GPS receiver (MODB) 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 MOD.
- 06/15/2004: Changed BH channels sampling rate to 40 Hz.
- 05/25/2000: Configured Z STS-1 for normal 360 second operation. Invesigated possible problem with FBA, but left equipment in place.
- 04/19/2000: Reinstalled NS STS-1. Replaced Z STS-1 5Hz unit replaced with 10Hz unit. Z STS-1 accidently left in 20 second operation.
- 12/19/1999: NS STS-1 removed.
- 11/13/1999: Data archival begun.
- 11/11/1999: GPS monument assembled, foam insulation added to seismometer pier, and malfunctioning FBA-ES-T replaced, making station fully functional.
- 10/18/1999: Station became partially operational. Warpless baseplates in use.
- 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: Wed Jun 25 13:34:08 PDT 2008