In:
Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 86, No. 37 ( 2005-09-13), p. 333-336
Abstract:
The transition from effusive, low mass flow rate to explosive, high mass flow rate eruptive behavior is a common aspect of the activity of calc‐alkaline volcanoes. However, the process driving the shift between the two eruptive styles is at present debatable and represents a topical theme in the volcanological literature. The main challenge is to understand the mechanism that allows a high mass flow rate when eruptions of highly porphyritic (40 vol % crystals) and viscous magmas (≥10 6 Pas, pascal second) occur. In this article, volcanological, compositional, and textural observations are used to demonstrate that viscous dissipation, a process that develops heating within flowing magma in a boundary layer near the conduit walls due to friction, is responsible for the long‐lasting, sustained explosive phases of this eruption type, as well as for the transition from effusive to explosive behavior.
Type of Medium:
Online Resource
ISSN:
0096-3941
,
2324-9250
DOI:
10.1029/2005EO370001
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2005
detail.hit.zdb_id:
24845-9
detail.hit.zdb_id:
2118760-5
detail.hit.zdb_id:
240154-X
SSG:
16,13
Permalink