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HUMO - Hull Mountain, OR, USA

NSN VSAT at HUMO

NSN VSAT at HUMO

2002/06/18 00:00:00 - Present

Latitude: 42.6071
Longitude: -122.9567
Elevation: 554.90 meters

STS-2 at HUMO

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:
SensorDataloggerStart DateEnd DateSEED ChannelsLocation
Battery VoltageQ41202002/06/18PresentLE?,UE?
Internal TemperatureQ41202002/06/18PresentUK?
Kinemetrics FBA ES-T Accel. (2 g max 10 v/g)Q41202002/06/18PresentBL?,LL?,HL?
Motorola MPX201 PressureQ41202002/06/18PresentLD?
Streckeisen STS-2 VBB Tri-Axial SeismometerQ41202002/06/18PresentBH?,HH?,VH?,UH?,UM?,LH?
YSI 44031 ThermistorQ41202002/06/18PresentLK?

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
1999 PSD 2000 PSD 2001 PSD 2002 PSD 2003 PSD 2004 PSD 2005 PSD

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.

Help on using these tools is available.

BDSN Overview | Map | Table



Berkeley Seismological Lab
215 McCone Hall, UC Berkeley
Berkeley CA 94720-4760
www@seismo.berkeley.edu

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Last modified: Wed Jun 25 13:34:08 PDT 2008