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The youngest highly explosive basaltic eruptions from Masaya Caldera (Nicaragua); stratigraphy and hazard assessment

Wendy Perez and Armin Freundt
The youngest highly explosive basaltic eruptions from Masaya Caldera (Nicaragua); stratigraphy and hazard assessment (in Volcanic hazards in Central America, William I. Rose (editor), Gregg J. S. Bluth (editor), Michael J. Carr (editor), John W. Ewert (editor), Lina C. Patino (editor) and James W. Vallence (editor))
Special Paper - Geological Society of America (2006) 412: 189-207

Abstract

The youngest highly explosive basaltic eruptions from Masaya Caldera in central western Nicaragua produced five main pyroclastic deposits: the San Antonio Tephra, La Concepcion Tephra, the Masaya Triple Layer, and the Masaya Tuff with the Ticuantepe Lapilli. This tephra sequence was deposited over the past approximately 6000 yr. The distribution and physical characteristics of these deposits suggest they originated from the Masaya Caldera. They have volumes ranging from 0.2 km (super 3) for La Concepcion Tephra to 3.9 km (super 3) for the Masaya Tuff and cover minimum areas of 600-1600 km (super 2) . All deposits formed by violent eruptions discharging 10 (super 11) to 10 (super 12) kg of magma, thus reaching eruption magnitudes between 4.3 and 5.9 and volcanic explosivity indices of 3-4. An analysis of hazards for the main population centers around the Masaya Caldera shows that, if there were a similar eruption today, the most vulnerable communities would be Ticuantepe, Nindiri, and Masaya. In addition, La Concepcion, southwest of the caldera, and the capital Managua, more than 15 km to the northwest, could be affected.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 412
Title: The youngest highly explosive basaltic eruptions from Masaya Caldera (Nicaragua); stratigraphy and hazard assessment
Title: Volcanic hazards in Central America
Author(s): Perez, WendyFreundt, Armin
Author(s): Rose, William I.editor
Author(s): Bluth, Gregg J. S.editor
Author(s): Carr, Michael J.editor
Author(s): Ewert, John W.editor
Author(s): Patino, Lina C.editor
Author(s): Vallence, James W.editor
Affiliation: IfM-GEOMAR, Kiel, Federal Republic of Germany
Affiliation: Michigan Technological University, Department of Geological Engineering and Sciences, Houghton, MI, United States
Pages: 189-207
Published: 2006
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2007-020900
Categories: Environmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch maps
N12°00'00" - N12°15'00", W86°19'60" - W86°00'00"
Secondary Affiliation: Rutgers University, USA, United StatesU. S. Geological Survey, USA, United StatesMichigan State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200712
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