Migratory earthquake precursors are dominant on an ice stream fault
Simple fault models predict earthquake nucleation near the eventual hypocenter (self-nucleation). However, some earthquakes have migratory foreshocks and possibly slow slip that travel large distances toward the eventual mainshock hypocenter (migratory nucleation). Scarce observations of migratory n...
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American Association for the Advancement of Science
2021
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ftunivtasmania:oai:eprints.utas.edu.au:37286 2023-05-15T13:31:54+02:00 Migratory earthquake precursors are dominant on an ice stream fault Barcheck, G Brodsky, EE Fulton, PM King, MA Siegfried, MR Tulaczyk, S 2021 application/pdf https://eprints.utas.edu.au/37286/ https://eprints.utas.edu.au/37286/1/142709%20-%20Migratory%20earthquake%20precursors%20are%20dominant%20on%20an%20ice%20stream%20fault.pdf en eng American Association for the Advancement of Science https://eprints.utas.edu.au/37286/1/142709%20-%20Migratory%20earthquake%20precursors%20are%20dominant%20on%20an%20ice%20stream%20fault.pdf Barcheck, G, Brodsky, EE, Fulton, PM, King, MA orcid:0000-0001-5611-9498 , Siegfried, MR and Tulaczyk, S 2021 , 'Migratory earthquake precursors are dominant on an ice stream fault' , Science Advances, vol. 7, no. 6 , pp. 1-8 , doi:10.1126/sciadv.abd0105 <http://dx.doi.org/10.1126/sciadv.abd0105>. Article PeerReviewed 2021 ftunivtasmania https://doi.org/10.1126/sciadv.abd0105 2021-09-20T22:18:57Z Simple fault models predict earthquake nucleation near the eventual hypocenter (self-nucleation). However, some earthquakes have migratory foreshocks and possibly slow slip that travel large distances toward the eventual mainshock hypocenter (migratory nucleation). Scarce observations of migratory nucleation may result from real differences between faults or merely observational limitations. We use Global Positioning System and passive seismic records of the easily observed daily ice stream earthquake cycle of the Whillans Ice Plain, West Antarctica, to quantify the prevalence of migratory versus self-nucleation in a large-scale, natural stick-slip system. We find abundant and predominantly migratory precursory slip, whereas self-nucleation is nearly absent. This demonstration that migratory nucleation exists on a natural fault implies that more-observable migratory precursors may also occur before some earthquakes. Article in Journal/Newspaper Antarc* Antarctica West Antarctica University of Tasmania: UTas ePrints West Antarctica Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Science Advances 7 6 |
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Open Polar |
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University of Tasmania: UTas ePrints |
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ftunivtasmania |
language |
English |
description |
Simple fault models predict earthquake nucleation near the eventual hypocenter (self-nucleation). However, some earthquakes have migratory foreshocks and possibly slow slip that travel large distances toward the eventual mainshock hypocenter (migratory nucleation). Scarce observations of migratory nucleation may result from real differences between faults or merely observational limitations. We use Global Positioning System and passive seismic records of the easily observed daily ice stream earthquake cycle of the Whillans Ice Plain, West Antarctica, to quantify the prevalence of migratory versus self-nucleation in a large-scale, natural stick-slip system. We find abundant and predominantly migratory precursory slip, whereas self-nucleation is nearly absent. This demonstration that migratory nucleation exists on a natural fault implies that more-observable migratory precursors may also occur before some earthquakes. |
format |
Article in Journal/Newspaper |
author |
Barcheck, G Brodsky, EE Fulton, PM King, MA Siegfried, MR Tulaczyk, S |
spellingShingle |
Barcheck, G Brodsky, EE Fulton, PM King, MA Siegfried, MR Tulaczyk, S Migratory earthquake precursors are dominant on an ice stream fault |
author_facet |
Barcheck, G Brodsky, EE Fulton, PM King, MA Siegfried, MR Tulaczyk, S |
author_sort |
Barcheck, G |
title |
Migratory earthquake precursors are dominant on an ice stream fault |
title_short |
Migratory earthquake precursors are dominant on an ice stream fault |
title_full |
Migratory earthquake precursors are dominant on an ice stream fault |
title_fullStr |
Migratory earthquake precursors are dominant on an ice stream fault |
title_full_unstemmed |
Migratory earthquake precursors are dominant on an ice stream fault |
title_sort |
migratory earthquake precursors are dominant on an ice stream fault |
publisher |
American Association for the Advancement of Science |
publishDate |
2021 |
url |
https://eprints.utas.edu.au/37286/ https://eprints.utas.edu.au/37286/1/142709%20-%20Migratory%20earthquake%20precursors%20are%20dominant%20on%20an%20ice%20stream%20fault.pdf |
long_lat |
ENVELOPE(-64.250,-64.250,-84.450,-84.450) |
geographic |
West Antarctica Whillans |
geographic_facet |
West Antarctica Whillans |
genre |
Antarc* Antarctica West Antarctica |
genre_facet |
Antarc* Antarctica West Antarctica |
op_relation |
https://eprints.utas.edu.au/37286/1/142709%20-%20Migratory%20earthquake%20precursors%20are%20dominant%20on%20an%20ice%20stream%20fault.pdf Barcheck, G, Brodsky, EE, Fulton, PM, King, MA orcid:0000-0001-5611-9498 , Siegfried, MR and Tulaczyk, S 2021 , 'Migratory earthquake precursors are dominant on an ice stream fault' , Science Advances, vol. 7, no. 6 , pp. 1-8 , doi:10.1126/sciadv.abd0105 <http://dx.doi.org/10.1126/sciadv.abd0105>. |
op_doi |
https://doi.org/10.1126/sciadv.abd0105 |
container_title |
Science Advances |
container_volume |
7 |
container_issue |
6 |
_version_ |
1766022167298834432 |