New observations of displacement steps associated with volcano seismic long-period events, constrained by step-table experiments

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Title: New observations of displacement steps associated with volcano seismic long-period events, constrained by step-table experiments
Authors: Thun, Johannes
Lokmer, Ivan
Bean, Christopher J.
Permanent link: http://hdl.handle.net/10197/7017
Date: 28-May-2015
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.
Funding Details: European Commission - Seventh Framework Programme (FP7)
Type of material: Journal Article
Publisher: American Geophysical Union (AGU)
Copyright (published version): 2015 American Geophysical Union
Keywords: LP activity;Turrialba Volcano;Etna Volcano;Static displacement;Lab experiments
DOI: 10.1002/2015GL063924
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Sciences Research Collection

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