| 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. |
| Genre: | Article |
| ProdID: | 70011224 |
| Citation Author: | Newhall, C. G.; Melson, W. G. |
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| Citation End Page: | 131 |
| Citation Issue: | 1-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Volcanology and Geothermal Research |
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| Citation Number Of Pages: | 21 |
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| Citation Search Results Text: | Explosive activity associated with the growth of volcanic domes; 1983; Article; Journal; Journal of Volcanology and Geothermal Research; Newhall, C. G.; Melson, W. G. |
| Citation Start Page: | 111 |
| Citation Volume: | 17 |
| Citation Year: | 1983 |
| Type: | citation/reference |
| Text: | Explosive activity associated with the growth of volcanic domes; 1983; Article; Journal; Journal of Volcanology and Geothermal Research; Newhall, C. G.; Melson, W. G. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1983 00:00 -0600 |
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