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)||Journal:||Geophysical Research Letters||Volume:||42||Issue:||10||Start page:||3855||End page:||3862||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||metadata.dc.date.available:||2015-11-27T04:00:11Z|
|Appears in Collections:||Earth Sciences Research Collection|
Show full item record
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.