Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake
We investigate the coseismic stress redistribution during the 25 March 1998 great Antarctic plate (Mw 8.1) earthquake, in which the mainschock consisted of two distinct subevents separated in time by several tens of seconds. We compute the dynamic stress time histories for the fault geometry and the...
Published in: | Bulletin of the Seismological Society of America |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | https://doi.org/10.1785/0120010164 https://ora.ox.ac.uk/objects/uuid:09d3c2a8-1561-43d9-8f8f-47ccec0a266f |
id |
ftuloxford:oai:ora.ox.ac.uk:uuid:09d3c2a8-1561-43d9-8f8f-47ccec0a266f |
---|---|
record_format |
openpolar |
spelling |
ftuloxford:oai:ora.ox.ac.uk:uuid:09d3c2a8-1561-43d9-8f8f-47ccec0a266f 2024-09-30T14:23:50+00:00 Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake Antonioli, A Cocco, M Das, S Henry, C 2016-07-28 https://doi.org/10.1785/0120010164 https://ora.ox.ac.uk/objects/uuid:09d3c2a8-1561-43d9-8f8f-47ccec0a266f eng eng doi:10.1785/0120010164 https://ora.ox.ac.uk/objects/uuid:09d3c2a8-1561-43d9-8f8f-47ccec0a266f https://doi.org/10.1785/0120010164 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.1785/0120010164 2024-09-06T07:47:27Z We investigate the coseismic stress redistribution during the 25 March 1998 great Antarctic plate (Mw 8.1) earthquake, in which the mainschock consisted of two distinct subevents separated in time by several tens of seconds. We compute the dynamic stress time histories for the fault geometry and the rupture and slip history determined by Henry et al. (2000), using the discrete wavenumber and reflectivity method of Cotton and Coutant (1997), both for a homogeneous and a stratified half-space. We first image the coseismic stress evolution caused by the first subevent on the fault plane of the second one for both the velocity models. We compute both shear and normal stress changes and a time-dependent Coulomb failure function (CFF). Our results show that the shear stress changes have larger amplitudes than the other stress components and hence are the primary control on the evolution of the CFF. The dynamic stress amplitudes are larger than the static stress perturbations, with the largest positive dynamic stress peak on the second subevent fault plane reaching slightly less than 0.2 MPa at 60 sec and 65 sec after the nucleation, for the layered and the homogeneous crustal models, respectively. We suggest that the dynamic stress changes caused by the first subevent promoted a nearly instantaneous failure on the second subevent fault. Article in Journal/Newspaper Antarc* Antarctic ORA - Oxford University Research Archive Antarctic Bulletin of the Seismological Society of America 92 3 896 903 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
description |
We investigate the coseismic stress redistribution during the 25 March 1998 great Antarctic plate (Mw 8.1) earthquake, in which the mainschock consisted of two distinct subevents separated in time by several tens of seconds. We compute the dynamic stress time histories for the fault geometry and the rupture and slip history determined by Henry et al. (2000), using the discrete wavenumber and reflectivity method of Cotton and Coutant (1997), both for a homogeneous and a stratified half-space. We first image the coseismic stress evolution caused by the first subevent on the fault plane of the second one for both the velocity models. We compute both shear and normal stress changes and a time-dependent Coulomb failure function (CFF). Our results show that the shear stress changes have larger amplitudes than the other stress components and hence are the primary control on the evolution of the CFF. The dynamic stress amplitudes are larger than the static stress perturbations, with the largest positive dynamic stress peak on the second subevent fault plane reaching slightly less than 0.2 MPa at 60 sec and 65 sec after the nucleation, for the layered and the homogeneous crustal models, respectively. We suggest that the dynamic stress changes caused by the first subevent promoted a nearly instantaneous failure on the second subevent fault. |
format |
Article in Journal/Newspaper |
author |
Antonioli, A Cocco, M Das, S Henry, C |
spellingShingle |
Antonioli, A Cocco, M Das, S Henry, C Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake |
author_facet |
Antonioli, A Cocco, M Das, S Henry, C |
author_sort |
Antonioli, A |
title |
Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake |
title_short |
Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake |
title_full |
Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake |
title_fullStr |
Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake |
title_full_unstemmed |
Dynamic stress triggering during the great 25 March 1998 Antarctic Plate earthquake |
title_sort |
dynamic stress triggering during the great 25 march 1998 antarctic plate earthquake |
publishDate |
2016 |
url |
https://doi.org/10.1785/0120010164 https://ora.ox.ac.uk/objects/uuid:09d3c2a8-1561-43d9-8f8f-47ccec0a266f |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
doi:10.1785/0120010164 https://ora.ox.ac.uk/objects/uuid:09d3c2a8-1561-43d9-8f8f-47ccec0a266f https://doi.org/10.1785/0120010164 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1785/0120010164 |
container_title |
Bulletin of the Seismological Society of America |
container_volume |
92 |
container_issue |
3 |
container_start_page |
896 |
op_container_end_page |
903 |
_version_ |
1811638716226076672 |