Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Geology Don't get GSW? Talk to your librarian.
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Geology; July 2004; v. 32; no. 7; p. 573-576; DOI: 10.1130/G20472.1
© 2004 Geological Society of America
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (13)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Wooller, L.
Right arrow Articles by Meyer, S.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Volcano spreading controlled by dipping substrata

Luke Wooller*,1, Benjamin van Wyk de Vries2, John B. Murray3, Hazel Rymer3 and Stephanie Meyer4

1 Volcano Dynamics Group, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK6 7AA, UK
2 Laboratoire Magmas et Volcans, Université Blaise Pascal, 5 rue Kessler, Clermont-Ferrand, France
3 Volcano Dynamics Group, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK6 7AA, UK
4 Laboratoire Magmas et Volcans, Université Blaise Pascal, 5 rue Kessler, Clermont-Ferrand, France

Most volcanoes grow on slopes, and some tend to fail catastrophically on the downslope side. Many volcanoes also deform by volcano spreading, which may lead to failure. We look at the effect of dipping substrata on the potential for spreading and collapse with analogue models. The dip is found to strongly control the spreading style, rate, and direction. A distinct change from purely radial spreading occurs even with small (<1°) substrata tilt. Structures on the cone and surrounding area are modified according to the underlying dip direction. Spreading becomes concentrated on downslope sectors, where movement is predominantly in the dip direction. The degree of structural realignment is a function of the slope angle. Our models are applied to previously known and new examples of volcano spreading. The effect of dipping substrata in confining spreading to sectors increases the potential for deep-seated sector collapses. This finding provides a mechanism for failure on the downslope side. The incorporation of substrata can create very large volume collapses.

Key Words: volcano spreading • substrata deformation • slope • analogue modeling • lateral collapse • debris avalanche • Tumisa volcanic complex




This article has been cited by other articles:


Home page
 Geological Society of America Special PapersHome page
L. Siebert, G. E. Alvarado, J. W. Vallance, and B. van Wyk de Vries
Large-volume volcanic edifice failures in Central America and associated hazards
Geological Society of America Special Papers, January 1, 2006; 412(0): 1 - 26.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Geological Society of America