The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates
Abstract The diffuse deformation zone between the Indian and Australian plates has hosted numerous major and great earthquakes during the seismological record, including the 11 April 2012 Mw 8.6 event, the largest recorded intraplate earthquake. On 2 March 2016, an Mw 7.8 strike‐slip faulting earthq...
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| Format: | Article |
| Language: | English |
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Wiley
2016-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL069931 |
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| author | Thorne Lay Lingling Ye Charles J. Ammon Audrey Dunham Keith D. Koper |
| author_facet | Thorne Lay Lingling Ye Charles J. Ammon Audrey Dunham Keith D. Koper |
| author_sort | Thorne Lay |
| collection | DOAJ |
| description | Abstract The diffuse deformation zone between the Indian and Australian plates has hosted numerous major and great earthquakes during the seismological record, including the 11 April 2012 Mw 8.6 event, the largest recorded intraplate earthquake. On 2 March 2016, an Mw 7.8 strike‐slip faulting earthquake occurred in the northwestern Wharton Basin, in a region bracketed by north‐south trending fracture zones with no previously recorded large event nearby. Despite the large magnitude, only minor source finiteness is evident in aftershock locations or resolvable from seismic wave processing including high‐frequency P wave backprojections and Love wave directivity analysis. Our analyses indicate that the event ruptured bilaterally on a north‐south trending fault over a length of up to 70 km, with rupture speed of ≤ 2 km/s, and a total duration of ~35 s. The estimated stress drop, ~20 MPa, is high, comparable to estimates for other large events in this broad intraplate oceanic deformation zone. |
| format | Article |
| id | doaj-art-e671e5cf51e94ee9b8bc9c26aa31acf0 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-e671e5cf51e94ee9b8bc9c26aa31acf02025-08-20T03:10:28ZengWileyGeophysical Research Letters0094-82761944-80072016-08-0143157937794510.1002/2016GL069931The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian PlatesThorne Lay0Lingling Ye1Charles J. Ammon2Audrey Dunham3Keith D. Koper4Department of Earth and Planetary Sciences University of California Santa Cruz California USASeismological Laboratory California Institute of Technology Pasadena California USADepartment of Geosciences Pennsylvania State University University Park Pennsylvania USADepartment of Geosciences Pennsylvania State University University Park Pennsylvania USADepartment of Geology and Geophysics University of Utah Salt Lake City Utah USAAbstract The diffuse deformation zone between the Indian and Australian plates has hosted numerous major and great earthquakes during the seismological record, including the 11 April 2012 Mw 8.6 event, the largest recorded intraplate earthquake. On 2 March 2016, an Mw 7.8 strike‐slip faulting earthquake occurred in the northwestern Wharton Basin, in a region bracketed by north‐south trending fracture zones with no previously recorded large event nearby. Despite the large magnitude, only minor source finiteness is evident in aftershock locations or resolvable from seismic wave processing including high‐frequency P wave backprojections and Love wave directivity analysis. Our analyses indicate that the event ruptured bilaterally on a north‐south trending fault over a length of up to 70 km, with rupture speed of ≤ 2 km/s, and a total duration of ~35 s. The estimated stress drop, ~20 MPa, is high, comparable to estimates for other large events in this broad intraplate oceanic deformation zone.https://doi.org/10.1002/2016GL069931Wharton Basinintraplate deformationstrike‐slip faulting2 March 2016 earthquake |
| spellingShingle | Thorne Lay Lingling Ye Charles J. Ammon Audrey Dunham Keith D. Koper The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates Geophysical Research Letters Wharton Basin intraplate deformation strike‐slip faulting 2 March 2016 earthquake |
| title | The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates |
| title_full | The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates |
| title_fullStr | The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates |
| title_full_unstemmed | The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates |
| title_short | The 2 March 2016 Wharton Basin Mw 7.8 earthquake: High stress drop north‐south strike‐slip rupture in the diffuse oceanic deformation zone between the Indian and Australian Plates |
| title_sort | 2 march 2016 wharton basin mw 7 8 earthquake high stress drop north south strike slip rupture in the diffuse oceanic deformation zone between the indian and australian plates |
| topic | Wharton Basin intraplate deformation strike‐slip faulting 2 March 2016 earthquake |
| url | https://doi.org/10.1002/2016GL069931 |
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