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Structures controlling volcanic activity within Masaya caldera, Nicaragua

Caravantes González, Guillermo; Rymer, Hazel; Zurek, Jeffrey; Ebmeier, Susanna K.; Blake, Stephen and Williams-Jones, Glyn (2019). Structures controlling volcanic activity within Masaya caldera, Nicaragua. Volcanica, 2(1) pp. 25–44.

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DOI (Digital Object Identifier) Link: https://doi.org/10.30909/vol.02.01.2544
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Abstract

Geophysical and geological observations collected in 2007-2012 shed light on the mechanisms controlling the style and location of eruptions within the Las Sierras-Masaya Caldera complex, Nicaragua. These results confirm a hypothesised ~3.5 km diameter structure with features compatible with the presence of a ring fracture (50-65°, with inward-dipping bounding walls). A central block is bound by this fracture and defines an incipient nested caldera related to the emptying of the magma chamber following the last Plinian eruption (1.8 ka). The prolongation of the Cofradías fault from the Managua graben represents the most significant structure on the floor of Masaya caldera. Current activity, including a convecting lava lake, largely depends on the interplay between the extensional stress regime associated with the Managua graben and deformation along the inner caldera bounding fault. This high spatial resolution survey uses a novel combination of geophysical methodologies to identify previously overlooked foci for future volcanic activity at Masaya.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 2610-3540
Keywords: Masaya volcano; structure; ring fracture; Caldera; InSAR; VLF; magnetics
Academic Unit/School: Other Departments > Other Departments
Other Departments
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 61077
Depositing User: Hazel Rymer
Date Deposited: 13 May 2019 08:45
Last Modified: 13 May 2019 20:39
URI: http://oro.open.ac.uk/id/eprint/61077
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