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A volcano bursting at the seams: Inflation, faulting, and eruption at Sierra Negra volcano, Galápagos

Geology

By:
, , , , , and
DOI: 10.1130/G22826A.1

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Abstract

The results of geodetic monitoring since 2002 at Sierra Negra volcano in the Galápagos Islands show that the filling and pressurization of an ∼2-km-deep sill eventually led to an eruption that began on 22 October 2005. Continuous global positioning system (CGPS) monitoring measured >2 m of accelerating inflation leading up to the eruption and contributed to nearly 5 m of total uplift since 1992, the largest precursory inflation ever recorded at a basaltic caldera. This extraordinary uplift was accommodated in part by repeated trapdoor faulting, and coseismic CGPS data provide strong constraints for improved deformation models. These results highlight the feedbacks between inflation, faulting, and eruption at a basaltic volcano, and demonstrate that faulting above an intruding magma body can relieve accumulated strain and effectively postpone eruption.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A volcano bursting at the seams: Inflation, faulting, and eruption at Sierra Negra volcano, Galápagos
Series title:
Geology
DOI:
10.1130/G22826A.1
Volume
34
Issue:
12
Year Published:
2006
Language:
English
Publisher:
Geological Society of America
Description:
4 p.
First page:
1025
Last page:
1028
Online Only (Y/N):
N
Additional Online Files(Y/N):
N