New observations of displacement steps associated with volcano seismic long-period events, constrained by step-table experiments
Files in This Item:
|thun_et_al_displacement_steps.pdf||2.3 MB||Adobe PDF||Download|
|Title:||New observations of displacement steps associated with volcano seismic long-period events, constrained by step-table experiments||Authors:||Thun, Johannes
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|
Show full item record