Geophysics
Seismic and Infrasound Network

Currently, Mt. Erebus is monitored by a permanent network of six, single-component 1 Hz seismometers, six three-component, 40-T broadband sensors, seven infrasonic microphones around the crater, some co-located with the summit seismic stations, GPS, infrared sensors, tiltmeters, and video. Stations are powered by gel-cell batteries recharged by solar panels; most stations now operate throughout the Austral winter, thanks to sufficient battery capacity combined with their low power consumption (approximately one Watt), however continuous station operation will vary from year to year.

References

Aster, R., McIntosh, W., Kyle, P., Esser, R., Bartel, B., Dunbar, N., Johns, B., Johnson, J., Karstens, R., Kurnik, C., McGowan, M., McNamara, S., Meertens, C., Pauly, B., Richmond, M., Ruiz, M., New instrumentation delivers multidisciplinary real-time data from Mount Erebus, Antarctica, EOS trans. AGU., 85, 9 March, 2004.

stationmap
click on map for larger view

(Above Insert) Map of Ross Island, Antarctica showing stations in the permanent MEVO short-period seismic network. (Main) Upper caldera summit view of Mt. Erebus showing the permanent broadband stations (light circles) and the temporary PASSCAL deployments during the 1996-1997 and the 1999-2000 field seasons (dark circles). Station RAY was destroyed by a volcanic bomb in 2004.

Table of Permanent Instruments currently Installed

Short period Stations Broadband Stations
ABB CON
BOM E1S
CON HOO
HOO LEH
ICE NKB
SIS RAY
   
Infrasound Infrared
E1S - IS1, IS2, IS3 NKB - IR1
NKB - IS1, IS2  
RAY - IS1, IS2  

 
Harmonic

Harmonic Tremor

Example of Harmonic Tremor. Seismogram and spectrogram of a tremor event on February 23, 2001 recorded at broadband station E1S and short-period station CON. This event shows a monochromatic initation at 9 Hz with a slight downward gliding, followed by a very stable harmonic part with a fundamental frequency near 2.0 Hz. This audio record is sped up by a factor of 100 relative to the actual seismic signal.

Harmonic Tremor

Harmonic tremor showing strong amplitude variations recorded at broadband stations LEH and HOO on February 14, 2003. Frequencies remain stable despite strong source amplitude variations. Note the variability in relative amplitude between the two stations; if the source is stationary this indicates a strongly varying source radiation pattern during the tremor episode. This audio record is sped up by a factor of 100 relative to the actual seismic signal.

 
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