Seismic activity of Mount Erebus, Antarctica in 1983-1984

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Mount Erebus is one of the active volcanoes in antarctica, and seismic observations of it have been made since December 1980 using a radiotelemetered network and several temporary stations. In the 1983-1984 field season, the number of the network stations was increased to eight by adding two new radio-telemetered stations. Volcanic earthquakes in and around Mount Erebus occurred at a rate of 20-160 events per day, which was almost the same rate as in the previous season. No intense earthquake swarm occurred in the 1983-1984 season. The earthquakes in this season are located wide around Mount Erebus. The clustered earthquakes have a dike-like distribution beneath the northern area of the central cone. An aseismic zone is recognized beneath the southwest area of the Erebus summit. This aseismic zone may correspond to a magma reservoir. The earthquakes which were not associated with the eruptions of Mount Erebus can be divided into several types according to their seismograms and spectra of the seismic waves. The seismic waves which may pass through the aseismic zone seem to be strongly attenuated as compared with those which may not pass through the zone.
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