Explosive activity associated with the growth of volcanic domes
Journal of Volcanology and Geothermal Research
By: C. G. Newhall and W.G. Melson
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Abstract
Domes offer unique opportunities to measure or infer the characteristics of magmas that, at domes and elsewhere, control explosive activity. A review of explosive activity associated with historical dome growth shows that: 1. (1) explosive activity has occurred in close association with nearly all historical dome growth; 2. (2) whole-rock SiO2 content, a crude but widely reported indicator of magma viscosity, shows no systematic relationship to the timing and character of explosions; 3. (3) the average rate of dome growth, a crude indicator of the rate of supply of magma and volatiles to the near-surface enviornment, shows no systematic relationship to the timing or character of explosions; and 4. (4) new studies at Arenal and Mount St. Helens suggest that water content is the dominant control on explosions from water-rich magmas, whereas the crystal content and composition of the interstitial melt (and hence magma viscosity) are equally or more important controls on explosions from water-poor magmas. New efforts should be made to improve current, rather limited techniques for monitoring pre-eruption volatile content and magma viscosity, and thus the explosive potential of magmas. ?? 1983.
Suggested Citation
Newhall, C.G., Melson, W., 1983, Explosive activity associated with the growth of volcanic domes: Journal of Volcanology and Geothermal Research, v. 17, no. 1-4, p. 111-131.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Explosive activity associated with the growth of volcanic domes |
| Series title | Journal of Volcanology and Geothermal Research |
| Volume | 17 |
| Issue | 1-4 |
| Year Published | 1983 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Volcanology and Geothermal Research |
| First page | 111 |
| Last page | 131 |