New surveys of MacDonald Seamount, southcentral Pacific, following volcanoseismic activity, 1977-1983
Abstract
Macdonald Volcano, located at the younger end of the Austral Islands chain and discovered in 1967 from teleseismic T waves, has been the site of intense volcanoseismic swarms from 1977 to January, 1984. Three new surveys of its summit, including by scuba divers, have revealed pinnacles reaching 27 m b.s.l., and a variety of fresh features, such as fractures and spatter cones. It is strongly suggested that the summit of the volcano swelled and the pinnacles grew since Johnson’s last survey in 1975.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- September 1984
- DOI:
- Bibcode:
- 1984GeoRL..11..813T
- Keywords:
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- Seismology: Seismic sources (mechanisms;
- magnitude;
- frequency spectrum;
- and time distribution);
- Tectonophysics: Plate tectonics;
- Volcanology: Volcanology topics;
- Information Related to Geographic Region: Pacific Ocean