Map
of California & Nevada earthquakes
HUMO - Hull Mountain, OR, USA
NSN VSAT at HUMO |
2002/06/18 00:00:00 - Present
Latitude: 42.6071
|
STS-2 at HUMO |
Location |
Geology |
Vault Conditions
Instrumentation |
Network |
Operation Notes
Noise Characteristics |
Data Availability
- Location:
-
Site is located on
BLM land on Hull Mountain, Oregon.
HUMO is a cooperative station with the Advanced National Seismic System and the Global Seismic Network.
- Geology:
-
Payne Cliffs formation - sandstone and siltstone
- Vault/Borehole conditions:
-
The equipment is located in a side adit of a hard-rock mine approximately
100 meters from the entrance. Overburden is approximately 50 meters.
The sensors are located on a concrete pier covered with 4" of rigid foam
insulation.
The datalogger, dial-up modem, and fiber optic modems are located in a plastic garden shed about 8 meters from the pier. Batteries are located in a large plastic storage box next to the shed. The tunnel entrance is covered with a hinged steel grate to allow free passage of bats. Humidity is 100% outside the enclosures. Telemetry is through 300 meters of fiber optic cable connected to a satellite system.
- Instrumentation:
-
Sensor Datalogger Start Date End Date SEED Channels Location Battery Voltage Q4120 2002/06/18 Present LE?,UE? Internal Temperature Q4120 2002/06/18 Present UK? Kinemetrics FBA ES-T Accel. (2 g max 10 v/g) Q4120 2002/06/18 Present BL?,LL?,HL? Motorola MPX201 Pressure Q4120 2002/06/18 Present LD? Streckeisen STS-2 VBB Tri-Axial Seismometer Q4120 2002/06/18 Present BH?,HH?,VH?,UH?,UM?,LH? YSI 44031 Thermistor Q4120 2002/06/18 Present LK? - Network:
-
BK (Berkeley Digital Seismic Network)
- Operation Notes: (may not be current)
- This section summarizes major changes in equipment or in instrumentation at HUMO.
- 06/15/2004: Changed BH channels sampling rate to 40 Hz.
- 07/01/2003: Changed HH channels to have causal filters.
- 06/21/2002: Sensors and datalogger become operational - dialup data only
- 10/29/2002: VSAT telemetry becomes operational
- 11/26/2002: STS-2 seismometer swapped out due to excessive noise
- 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.
|
|
|
Berkeley Seismological Lab
|
|
Copyright 1995-2005, The Regents of the University of California.
Last modified: Wed Jun 25 13:34:08 PDT 2008