Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple cases
Abstract Numerous investigations of supershear earthquakes make a conclusion that a supershear earthquake produces a seismic shock wave on the ground that may increase the resulting destruction. We investigate a supershear rupture promoted by the free surface and find out that although the seismic e...
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| Format: | Article |
| Language: | English |
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Wiley
2017-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL074158 |
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| author | Zhenguo Zhang Jiankuan Xu Hanqing Huang Xiaofei Chen |
| author_facet | Zhenguo Zhang Jiankuan Xu Hanqing Huang Xiaofei Chen |
| author_sort | Zhenguo Zhang |
| collection | DOAJ |
| description | Abstract Numerous investigations of supershear earthquakes make a conclusion that a supershear earthquake produces a seismic shock wave on the ground that may increase the resulting destruction. We investigate a supershear rupture promoted by the free surface and find out that although the seismic energy of a supershear earthquake can be transmitted further with large amplitudes, the peak slip velocity on a fault near the free surface is smaller than that caused by a subshear rupture earthquake. Our results show that the free‐surface‐induced supershear rupture mitigates the amplitudes of ground motions near the fault plane compared with the subshear rupture. The Coulomb failure change derived from dynamic modeling further suggests that this free‐surface‐induced supershear reduces aftershock potential compared to a subshear rupture. Both ground motion at near‐fault and aftershock possibility show low risk for the free‐surface‐induced supershear rupture earthquake than subshear earthquake, contrary to the traditional concept. |
| format | Article |
| id | doaj-art-e080c628ac8a4dc49ccdd7ad3b8ad86f |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2017-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-e080c628ac8a4dc49ccdd7ad3b8ad86f2025-08-20T01:51:46ZengWileyGeophysical Research Letters0094-82761944-80072017-07-0144136712671710.1002/2017GL074158Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple casesZhenguo Zhang0Jiankuan Xu1Hanqing Huang2Xiaofei Chen3Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen ChinaDepartment of Earth and Space Sciences Southern University of Science and Technology Shenzhen ChinaSchool of Earth and Space Sciences University of Science and Technology of China Hefei ChinaDepartment of Earth and Space Sciences Southern University of Science and Technology Shenzhen ChinaAbstract Numerous investigations of supershear earthquakes make a conclusion that a supershear earthquake produces a seismic shock wave on the ground that may increase the resulting destruction. We investigate a supershear rupture promoted by the free surface and find out that although the seismic energy of a supershear earthquake can be transmitted further with large amplitudes, the peak slip velocity on a fault near the free surface is smaller than that caused by a subshear rupture earthquake. Our results show that the free‐surface‐induced supershear rupture mitigates the amplitudes of ground motions near the fault plane compared with the subshear rupture. The Coulomb failure change derived from dynamic modeling further suggests that this free‐surface‐induced supershear reduces aftershock potential compared to a subshear rupture. Both ground motion at near‐fault and aftershock possibility show low risk for the free‐surface‐induced supershear rupture earthquake than subshear earthquake, contrary to the traditional concept.https://doi.org/10.1002/2017GL074158supershear earthquakedynamic rupturefree surface |
| spellingShingle | Zhenguo Zhang Jiankuan Xu Hanqing Huang Xiaofei Chen Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple cases Geophysical Research Letters supershear earthquake dynamic rupture free surface |
| title | Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple cases |
| title_full | Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple cases |
| title_fullStr | Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple cases |
| title_full_unstemmed | Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple cases |
| title_short | Seismic characteristics of supershear and sub‐Rayleigh earthquakes: Implication from simple cases |
| title_sort | seismic characteristics of supershear and sub rayleigh earthquakes implication from simple cases |
| topic | supershear earthquake dynamic rupture free surface |
| url | https://doi.org/10.1002/2017GL074158 |
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