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Deformation studies on soufriere, st. Vincent, between 1977 and 1981
Science (New York, N.Y.)
|June 4, 1982
Summary
Soufriere Volcano showed gradual inflation before April 1979 explosions and rapid deflation afterward. Greater tilt at a distance suggests a deep magma chamber, over 10 km below the surface.
Area of Science:
- Geophysics
- Volcanology
- Geodesy
Background:
- Soufriere Volcano's eruptive history.
- Precursory signals of volcanic unrest.
Purpose of the Study:
- To analyze ground deformation at Soufriere Volcano before and after the April 1979 eruptions.
- To infer the subsurface magma system based on tilt measurements.
Main Methods:
- Dry-tilt measurements were conducted at two stations.
- Analysis of tilt data at varying distances from the summit.
Main Results:
- Gradual ground inflation of at least 10 microradians was observed before the initial explosions.
- Rapid deflation exceeding 20 microradians occurred after the onset of activity.
- Tilt magnitude was approximately twice as large at a distance of 6.5 km compared to 2.5 km from the summit.
Conclusions:
- The observed deformation pattern is consistent with magma movement beneath the volcano.
- The differential tilt measurements suggest the presence of a magma chamber at a depth greater than 10 kilometers.
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