Stability of earthquake moment tensor inversions: effect of the double-couple constraint
We show that spurious large non-double-couple components can be obtained in inversions for the full deviatoric moment tensor for shallow crustal earthquakes due to inaccurate Earth models. The traditional "best double-couple" solution does not in general provide an optimal estimate of a do...
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Online Access: | https://doi.org/10.1016/S0040-1951(02)00379-7 https://ora.ox.ac.uk/objects/uuid:06118d07-0aa4-4d40-85e2-9b1a0549695e |
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ftuloxford:oai:ora.ox.ac.uk:uuid:06118d07-0aa4-4d40-85e2-9b1a0549695e 2024-09-30T14:26:42+00:00 Stability of earthquake moment tensor inversions: effect of the double-couple constraint Henry, C Woodhouse, J Das, S 2016-07-28 https://doi.org/10.1016/S0040-1951(02)00379-7 https://ora.ox.ac.uk/objects/uuid:06118d07-0aa4-4d40-85e2-9b1a0549695e unknown doi:10.1016/S0040-1951(02)00379-7 https://ora.ox.ac.uk/objects/uuid:06118d07-0aa4-4d40-85e2-9b1a0549695e https://doi.org/10.1016/S0040-1951(02)00379-7 info:eu-repo/semantics/embargoedAccess Conference item 2016 ftuloxford https://doi.org/10.1016/S0040-1951(02)00379-7 2024-09-06T07:47:27Z We show that spurious large non-double-couple components can be obtained in inversions for the full deviatoric moment tensor for shallow crustal earthquakes due to inaccurate Earth models. The traditional "best double-couple" solution does not in general provide an optimal estimate of a double-couple mechanism, and is only reliable when the non-double-couple component of the full deviatoric solution is small. The inverse problem for the moment tensors of the 1998 Antarctic Plate and 2000 Wharton Basin strike-slip earthquakes is shown in each case to have two well-fitting minima in the misfit function of pure double-couple solutions. Such pairs of solutions are most likely to exist for earthquakes which are close either to vertical strike-slip or to dip-slip on a fault plane dipping at 45°. It is shown theoretically that these pairs of solutions arise from the combination of the pure double-couple constraint and the instability of two elements of the moment tensor. No significant non-double-couple component is found for the shallow thrusting 1996 Biak, Indonesia earthquake. © 2002 Elsevier Science B.V. All rights reserved. Conference Object Antarc* Antarctic ORA - Oxford University Research Archive Antarctic Wharton ENVELOPE(157.817,157.817,-81.050,-81.050) Tectonophysics 356 1-3 115 124 |
institution |
Open Polar |
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ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
unknown |
description |
We show that spurious large non-double-couple components can be obtained in inversions for the full deviatoric moment tensor for shallow crustal earthquakes due to inaccurate Earth models. The traditional "best double-couple" solution does not in general provide an optimal estimate of a double-couple mechanism, and is only reliable when the non-double-couple component of the full deviatoric solution is small. The inverse problem for the moment tensors of the 1998 Antarctic Plate and 2000 Wharton Basin strike-slip earthquakes is shown in each case to have two well-fitting minima in the misfit function of pure double-couple solutions. Such pairs of solutions are most likely to exist for earthquakes which are close either to vertical strike-slip or to dip-slip on a fault plane dipping at 45°. It is shown theoretically that these pairs of solutions arise from the combination of the pure double-couple constraint and the instability of two elements of the moment tensor. No significant non-double-couple component is found for the shallow thrusting 1996 Biak, Indonesia earthquake. © 2002 Elsevier Science B.V. All rights reserved. |
format |
Conference Object |
author |
Henry, C Woodhouse, J Das, S |
spellingShingle |
Henry, C Woodhouse, J Das, S Stability of earthquake moment tensor inversions: effect of the double-couple constraint |
author_facet |
Henry, C Woodhouse, J Das, S |
author_sort |
Henry, C |
title |
Stability of earthquake moment tensor inversions: effect of the double-couple constraint |
title_short |
Stability of earthquake moment tensor inversions: effect of the double-couple constraint |
title_full |
Stability of earthquake moment tensor inversions: effect of the double-couple constraint |
title_fullStr |
Stability of earthquake moment tensor inversions: effect of the double-couple constraint |
title_full_unstemmed |
Stability of earthquake moment tensor inversions: effect of the double-couple constraint |
title_sort |
stability of earthquake moment tensor inversions: effect of the double-couple constraint |
publishDate |
2016 |
url |
https://doi.org/10.1016/S0040-1951(02)00379-7 https://ora.ox.ac.uk/objects/uuid:06118d07-0aa4-4d40-85e2-9b1a0549695e |
long_lat |
ENVELOPE(157.817,157.817,-81.050,-81.050) |
geographic |
Antarctic Wharton |
geographic_facet |
Antarctic Wharton |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
doi:10.1016/S0040-1951(02)00379-7 https://ora.ox.ac.uk/objects/uuid:06118d07-0aa4-4d40-85e2-9b1a0549695e https://doi.org/10.1016/S0040-1951(02)00379-7 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1016/S0040-1951(02)00379-7 |
container_title |
Tectonophysics |
container_volume |
356 |
container_issue |
1-3 |
container_start_page |
115 |
op_container_end_page |
124 |
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1811632823410360320 |