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New observations of displacement steps associated with volcano seismic long-period events, constrained by step-table experiments
Date Issued
2015-05-28
Date Available
2015-11-27T04:00:11Z
Abstract
Long-period (LP) volcano seismic events often precede volcanic eruptions and are viewed with considerable interest in hazard assessment. They are usually thought to be associated with resonating fluid-filled conduits although alternative models involving material failure have recently been proposed. Through recent field experiments, we uncovered a step-like displacement component associated with some LP events, outside the spectral range of the typically narrow-band analysis for this kind of event. Bespoke laboratory experiments with step tables show that steps of the order of a few micrometers can be extracted from seismograms, where long-period noise is estimated and removed with moving median filters. Using these constraints, we observe step-like ground deformation in LP recordings near the summits of Turrialba and Etna Volcanoes. This represents a previously unobserved static component in the source time history of LP events, with implications for the underlying source process.
Sponsorship
European Commission - Seventh Framework Programme (FP7)
Type of Material
Journal Article
Publisher
American Geophysical Union (AGU)
Journal
Geophysical Research Letters
Volume
42
Issue
10
Start Page
3855
End Page
3862
Copyright (Published Version)
2015 American Geophysical Union
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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