NDLI: Identifying rift zones on volcanoes: an example from La Réunion island, Indian Ocean

Content Provider	Springer Nature Link
Author	Bonali, Fabio Luca Corazzato, Claudia Tibaldi, Alessandro
Copyright Year	2010
Abstract	We describe a methodology for identifying complex rift zones on recent or active volcanoes, where structures hidden by recent deposits and logistical conditions might prevent carrying out detailed fieldwork. La Réunion island was chosen as a test-site. We used georeferenced topographic maps, aerial photos and digital terrain models to perform a statistical analysis of several morphometric parameters of pyroclastic cones. This provides a great deal of geometric information that can help in distinguishing the localisation and orientation of buried magma-feeding fractures, which constitute the surface expression of rift zones. It also allowed the construction of a complete GIS database of the pyroclastic cones. La Réunion is a perfect example where past and active volcanic rift zones are mostly expressed by clusters of monogenic centres. The data has been validated in the field and compared and integrated with the distribution and geometry of dyke swarms. Results show the presence of several main and secondary rift segments of different ages, locations and orientations, whose origin is discussed considering regional tectonics, local geomorphology, and volcano deformation.
Starting Page	347
Ending Page	366
Page Count	20
File Format	PDF
ISSN	02588900
Journal	Bulletin of Volcanology
Volume Number	73
Issue Number	3
e-ISSN	14320819
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-10-05
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pyroclastic cones GIS (Geographic Information System) La Réunion Tectonics Rift zones Sedimentology Geology Geophysics/Geodesy Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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