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MOD - Modoc Plateau, CA, USA
- Location:
-
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:
-
Pyroclastic Rock
- Vault/Borehole conditions:
-
The vault is a horizontal tunnel, located beneath
5 meters of overburden to maintain thermal stability.
- Instrumentation:
-
| 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:
-
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:
-
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 |
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 |
 |
 |
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- Data Availability:
- BDSN waveforms and associated metadata are available at the
Northern California Earthquake Data Center (NCEDC).
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.
Copyright 1995-2005, The Regents of the University of California.
Last modified: Wed Jun 25 13:34:08 PDT 2008
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