Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland
We use shear wave splitting (SWS) above microearthquakes to monitor stress variations before the 2010 March and April flank and summit eruptions of Eyjafjallajökull volcano in Iceland. SWS time delays before Eyjafjallajökull show characteristic variations similar to those seen before earthquakes. Th...
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fthighwire:oai:open-archive.highwire.org:gji:199/1/102 2023-05-15T16:09:23+02:00 Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland Liu, Sha Crampin, Stuart Luckett, Richard Yang, Jiansi 2014-07-31 08:16:11.0 text/html http://gji.oxfordjournals.org/cgi/content/short/199/1/102 https://doi.org/10.1093/gji/ggu202 en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/199/1/102 http://dx.doi.org/10.1093/gji/ggu202 Copyright (C) 2014, Oxford University Press Seismology TEXT 2014 fthighwire https://doi.org/10.1093/gji/ggu202 2016-11-16T17:01:10Z We use shear wave splitting (SWS) above microearthquakes to monitor stress variations before the 2010 March and April flank and summit eruptions of Eyjafjallajökull volcano in Iceland. SWS time delays before Eyjafjallajökull show characteristic variations similar to those seen before earthquakes. The time delays display a nearly linear increase before the eruption, an abrupt change of slope and a rapid nearly linear decrease until the flank eruption begins. Similar variations before earthquakes are interpreted as stress-accumulation increases, and stress-relaxation decreases as microcracks coalesce onto the eventual fault plane. The changes in SWS before Eyjafjallajökull are interpreted as a similar stress-accumulation increase, as magma penetrates the crust, and stress-relaxation decrease as microcracks coalesce onto the magma conduit prior to magma release. We suggest that the remarkable similarity between stress changes before eruption and earthquake is strong evidence for the New Geophysics of a critically microcracked crust. Text Eyjafjallajökull Iceland HighWire Press (Stanford University) Eyjafjallajokull ENVELOPE(-19.633,-19.633,63.631,63.631) Geophysical Journal International 199 1 102 112 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Seismology |
spellingShingle |
Seismology Liu, Sha Crampin, Stuart Luckett, Richard Yang, Jiansi Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland |
topic_facet |
Seismology |
description |
We use shear wave splitting (SWS) above microearthquakes to monitor stress variations before the 2010 March and April flank and summit eruptions of Eyjafjallajökull volcano in Iceland. SWS time delays before Eyjafjallajökull show characteristic variations similar to those seen before earthquakes. The time delays display a nearly linear increase before the eruption, an abrupt change of slope and a rapid nearly linear decrease until the flank eruption begins. Similar variations before earthquakes are interpreted as stress-accumulation increases, and stress-relaxation decreases as microcracks coalesce onto the eventual fault plane. The changes in SWS before Eyjafjallajökull are interpreted as a similar stress-accumulation increase, as magma penetrates the crust, and stress-relaxation decrease as microcracks coalesce onto the magma conduit prior to magma release. We suggest that the remarkable similarity between stress changes before eruption and earthquake is strong evidence for the New Geophysics of a critically microcracked crust. |
format |
Text |
author |
Liu, Sha Crampin, Stuart Luckett, Richard Yang, Jiansi |
author_facet |
Liu, Sha Crampin, Stuart Luckett, Richard Yang, Jiansi |
author_sort |
Liu, Sha |
title |
Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland |
title_short |
Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland |
title_full |
Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland |
title_fullStr |
Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland |
title_full_unstemmed |
Changes in shear wave splitting before the 2010 Eyjafjallajokull eruption in Iceland |
title_sort |
changes in shear wave splitting before the 2010 eyjafjallajokull eruption in iceland |
publisher |
Oxford University Press |
publishDate |
2014 |
url |
http://gji.oxfordjournals.org/cgi/content/short/199/1/102 https://doi.org/10.1093/gji/ggu202 |
long_lat |
ENVELOPE(-19.633,-19.633,63.631,63.631) |
geographic |
Eyjafjallajokull |
geographic_facet |
Eyjafjallajokull |
genre |
Eyjafjallajökull Iceland |
genre_facet |
Eyjafjallajökull Iceland |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/199/1/102 http://dx.doi.org/10.1093/gji/ggu202 |
op_rights |
Copyright (C) 2014, Oxford University Press |
op_doi |
https://doi.org/10.1093/gji/ggu202 |
container_title |
Geophysical Journal International |
container_volume |
199 |
container_issue |
1 |
container_start_page |
102 |
op_container_end_page |
112 |
_version_ |
1766405289732472832 |