Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China
Abstract Based on magnetotelluric array data and the three‐dimensional (3D) inversion algorithm, we obtain the 3D electrical structure of the 1976 Ms7.8 Tangshan earthquake zone. The seismogenic structure comprised a thick resistive anomaly located east of the Tangshan fault (TSF), a thin resistive...
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| Format: | Article |
| Language: | English |
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Wiley
2023-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL102291 |
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| author | Juntao Cai Xiaobin Chen Zeyi Dong Yan Zhan Zhongyin Liu Tengfa Cui Feng Jiang |
| author_facet | Juntao Cai Xiaobin Chen Zeyi Dong Yan Zhan Zhongyin Liu Tengfa Cui Feng Jiang |
| author_sort | Juntao Cai |
| collection | DOAJ |
| description | Abstract Based on magnetotelluric array data and the three‐dimensional (3D) inversion algorithm, we obtain the 3D electrical structure of the 1976 Ms7.8 Tangshan earthquake zone. The seismogenic structure comprised a thick resistive anomaly located east of the Tangshan fault (TSF), a thin resistive belt extending westward, and the TSF zone. A geodynamic model is proposed based on the 3D electrical model and the other research findings. The model indicates that the primary cause of the Tangshan earthquake was the almost EW‐trending horizontal pushing from the west. The local uplift of deep thermal materials on the west side of TSF produces tensile deformation superimposed on the existing shear deformation. The combined effect of these two forces controls the Tangshan earthquake deformation characteristic. Prevailing horizontal pushing from the west and local uplift of hot material may be associated with the Tibet Plateau's eastward escape and the subduction of the Pacific plate. |
| format | Article |
| id | doaj-art-6db6af176d924711b8d5b8463abfca54 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2023-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-6db6af176d924711b8d5b8463abfca542025-08-20T02:11:58ZengWileyGeophysical Research Letters0094-82761944-80072023-07-015014n/an/a10.1029/2022GL102291Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, ChinaJuntao Cai0Xiaobin Chen1Zeyi Dong2Yan Zhan3Zhongyin Liu4Tengfa Cui5Feng Jiang6National Institute of Natural Hazards Ministry of Emergency Management of China Beijing ChinaNational Institute of Natural Hazards Ministry of Emergency Management of China Beijing ChinaState Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing ChinaState Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing ChinaState Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing ChinaState Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing ChinaCAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology Guangzhou ChinaAbstract Based on magnetotelluric array data and the three‐dimensional (3D) inversion algorithm, we obtain the 3D electrical structure of the 1976 Ms7.8 Tangshan earthquake zone. The seismogenic structure comprised a thick resistive anomaly located east of the Tangshan fault (TSF), a thin resistive belt extending westward, and the TSF zone. A geodynamic model is proposed based on the 3D electrical model and the other research findings. The model indicates that the primary cause of the Tangshan earthquake was the almost EW‐trending horizontal pushing from the west. The local uplift of deep thermal materials on the west side of TSF produces tensile deformation superimposed on the existing shear deformation. The combined effect of these two forces controls the Tangshan earthquake deformation characteristic. Prevailing horizontal pushing from the west and local uplift of hot material may be associated with the Tibet Plateau's eastward escape and the subduction of the Pacific plate.https://doi.org/10.1029/2022GL102291Tangshan earthquakeNorth Chinamagnetotellurricthree‐dimensional electrical structure |
| spellingShingle | Juntao Cai Xiaobin Chen Zeyi Dong Yan Zhan Zhongyin Liu Tengfa Cui Feng Jiang Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China Geophysical Research Letters Tangshan earthquake North China magnetotellurric three‐dimensional electrical structure |
| title | Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China |
| title_full | Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China |
| title_fullStr | Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China |
| title_full_unstemmed | Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China |
| title_short | Three‐Dimensional Electrical Structure Beneath the Epicenter Zone and Seismogenic Setting of the 1976 Ms7.8 Tangshan Earthquake, China |
| title_sort | three dimensional electrical structure beneath the epicenter zone and seismogenic setting of the 1976 ms7 8 tangshan earthquake china |
| topic | Tangshan earthquake North China magnetotellurric three‐dimensional electrical structure |
| url | https://doi.org/10.1029/2022GL102291 |
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