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Pit crater structure and processes governing persistent activity at Masaya Volcano, Nicaragua

Authors
  • Rymer, Hazel1
  • van Wyk de Vries, Benjamin1
  • Stix, John2
  • Williams-Jones, Glyn2
  • 1 Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, UK Fax: +44 1908 652558 e-mail: [email protected], GB
  • 2 Department of Geology, Université de Montreal, CP. 6100, Montreal, Canada, CA
Type
Published Article
Journal
Bulletin of Volcanology
Publisher
Springer-Verlag
Publication Date
Mar 01, 1998
Volume
59
Issue
5
Pages
345–355
Identifiers
DOI: 10.1007/s004450050196
Source
Springer Nature
Keywords
License
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Abstract

Persistent activity at Masaya Volcano, Nicaragua, is characterised by cycles of intense degassing, lava lake development and pit crater formation. It provides a useful site to study the processes which govern such activity, because of its easy accessibility and relatively short cycles (years to decades). An understanding of the present activity is important because Masaya is visited by large numbers of tourists, is located close to major cities and has produced voluminous lavas, plinian eruptions and ignimbrites in the recent past. We provide structural and geophysical data that characterise the "normal" present state of activity. These indicate that the ongoing degassing phase (1993 to present) was not caused by fresh magma intrusion. It was associated with shallow density changes within the active Santiago pit crater. The activity appears to be associated predominantly with shallow changes in the pit crater structure. More hazardous activity will occur only if there are significant departures from the present gravity, deformation and seismic signatures.

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