Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory
In this paper, we propose an approach to compute the coseismic Earth's volume change based on a spherical-Earth elastic dislocation theory. We present a general expression of the Earth's volume change for three typical dislocations: the shear, tensile and explosion sources. We conduct a ca...
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fthighwire:oai:open-archive.highwire.org:gji:199/3/1655 2023-05-15T17:52:40+02:00 Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory Xu, Changyi Sun, Wenke 2014-10-15 09:48:10.0 text/html http://gji.oxfordjournals.org/cgi/content/short/199/3/1655 https://doi.org/10.1093/gji/ggu364 en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/199/3/1655 http://dx.doi.org/10.1093/gji/ggu364 Copyright (C) 2014, Oxford University Press Geodynamics and tectonics TEXT 2014 fthighwire https://doi.org/10.1093/gji/ggu364 2016-11-16T17:01:13Z In this paper, we propose an approach to compute the coseismic Earth's volume change based on a spherical-Earth elastic dislocation theory. We present a general expression of the Earth's volume change for three typical dislocations: the shear, tensile and explosion sources. We conduct a case study for the 2004 Sumatra earthquake ( M w 9.3), the 2010 Chile earthquake ( M w 8.8), the 2011 Tohoku-Oki earthquake ( M w 9.0) and the 2013 Okhotsk Sea earthquake ( M w 8.3). The results show that mega-thrust earthquakes make the Earth expand and earthquakes along a normal fault make the Earth contract. We compare the volume changes computed for finite fault models and a point source of the 2011 Tohoku-Oki earthquake ( M w 9.0). The big difference of the results indicates that the coseismic changes in the Earth's volume (or the mean radius) are strongly dependent on the earthquakes’ focal mechanism, especially the depth and the dip angle. Then we estimate the cumulative volume changes by historical earthquakes ( M w ≥ 7.0) since 1960, and obtain an Earth mean radius expanding rate about 0.011 mm yr−1. Text okhotsk sea HighWire Press (Stanford University) Okhotsk Geophysical Journal International 199 3 1655 1661 |
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Open Polar |
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HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Geodynamics and tectonics |
spellingShingle |
Geodynamics and tectonics Xu, Changyi Sun, Wenke Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory |
topic_facet |
Geodynamics and tectonics |
description |
In this paper, we propose an approach to compute the coseismic Earth's volume change based on a spherical-Earth elastic dislocation theory. We present a general expression of the Earth's volume change for three typical dislocations: the shear, tensile and explosion sources. We conduct a case study for the 2004 Sumatra earthquake ( M w 9.3), the 2010 Chile earthquake ( M w 8.8), the 2011 Tohoku-Oki earthquake ( M w 9.0) and the 2013 Okhotsk Sea earthquake ( M w 8.3). The results show that mega-thrust earthquakes make the Earth expand and earthquakes along a normal fault make the Earth contract. We compare the volume changes computed for finite fault models and a point source of the 2011 Tohoku-Oki earthquake ( M w 9.0). The big difference of the results indicates that the coseismic changes in the Earth's volume (or the mean radius) are strongly dependent on the earthquakes’ focal mechanism, especially the depth and the dip angle. Then we estimate the cumulative volume changes by historical earthquakes ( M w ≥ 7.0) since 1960, and obtain an Earth mean radius expanding rate about 0.011 mm yr−1. |
format |
Text |
author |
Xu, Changyi Sun, Wenke |
author_facet |
Xu, Changyi Sun, Wenke |
author_sort |
Xu, Changyi |
title |
Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory |
title_short |
Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory |
title_full |
Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory |
title_fullStr |
Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory |
title_full_unstemmed |
Earthquake-origin expansion of the Earth inferred from a spherical-Earth elastic dislocation theory |
title_sort |
earthquake-origin expansion of the earth inferred from a spherical-earth elastic dislocation theory |
publisher |
Oxford University Press |
publishDate |
2014 |
url |
http://gji.oxfordjournals.org/cgi/content/short/199/3/1655 https://doi.org/10.1093/gji/ggu364 |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
okhotsk sea |
genre_facet |
okhotsk sea |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/199/3/1655 http://dx.doi.org/10.1093/gji/ggu364 |
op_rights |
Copyright (C) 2014, Oxford University Press |
op_doi |
https://doi.org/10.1093/gji/ggu364 |
container_title |
Geophysical Journal International |
container_volume |
199 |
container_issue |
3 |
container_start_page |
1655 |
op_container_end_page |
1661 |
_version_ |
1766160366488780800 |