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ABSTRACTS | ABSTRACT DETAILS

 

Author:Charles R. Wilson
Institution:903 Koyukuk Drive, Fairbanks, AK 99775
Email:crw@gi.alaska.edu
Authors:Charles R. Wilson, John V. Olson and Daniel L. Osborne
Abstract Title:

"Infrasound from the Seismic Tremor of Mt. Erebus Volcano observed at I55US "
Abstract:

With the installation in 2001 of the I55US CTBT/IMS infrasonic array on the Ross Ice Shelf it has been possible to observe infrasound that is radiated by the seismic tremor of Mt. Erebus. The crater on Erebus is about 25 kilometers to the west northwest of the I55US 8 sensor infrasonic array at an azimuth of 337°. During a survey of the infrasonic data, to document further impulsive signals from the small strombolian eruptions in the lava lake on Erebus, it was noticed that at times there was a very low amplitude coherent signal that lasted many hours. The signal, with frequencies in the passband from 1 to 10 Hz, arrives with acoustic velocity at the array from the direction of Mt. Erebus. Many such Erebus-tremor infrasound events in the data set were identified in the period from April 2002 to March 2003. The very low RMS amplitude of the tremor signals, of about 0.006 Pa, places them near the lower limit of detectability for the array. The Mt. Erebus tremor infrasound observed at I55US will be described in this presentation.
Keywords:volcano, seismicity, infrasound

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