Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos Block
The Zhuozishan West Piedmont Fault (ZWPF) is an active normal fault in the northwestern corner of the Ordos Block. Studying the recurrence characteristics of paleoearthquakes is useful for understanding the regional seismic hazard potential. In this study, paleoseismic trench and optically stimulate...
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.942242/full |
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| author | Xingwang Liu Xingwang Liu Zemin Gao Qiyun Lei Yanxiu Shao Yunsheng Yao Yunsheng Yao |
| author_facet | Xingwang Liu Xingwang Liu Zemin Gao Qiyun Lei Yanxiu Shao Yunsheng Yao Yunsheng Yao |
| author_sort | Xingwang Liu |
| collection | DOAJ |
| description | The Zhuozishan West Piedmont Fault (ZWPF) is an active normal fault in the northwestern corner of the Ordos Block. Studying the recurrence characteristics of paleoearthquakes is useful for understanding the regional seismic hazard potential. In this study, paleoseismic trench and optically stimulated luminescence (OSL) dating methods are used to determine the temporal sequence of paleoearthquakes. Severn earthquakes were constrained to be E7 (73.4 ± 12.9 ka to 75.3 ± 10.6 ka), E6, (63.7 ± 7.4 ka to 64.4 ± 8.2 ka), E5 (53.2 ± 7.0 ka to 58.7 ± 6.5 ka), E4 (42.6 ± 6.3 ka to 47.7 ± 5.8 ka), E3 (31.0–3.4 ka to 31.3 ± 3.4 ka), E2 (26.1 ± 2.7 ka to 28.1 ± 3.8 ka) and E1 (15.8 ± 1.9 ka to 20.2 ± 2.6 ka). The recurrence interval of strong earthquakes in the ZWPF is roughly constrained to be 8.1–14 ka, with magnitudes of Mw 7.0–7.4 that ruptured the entire fault. Based on the timing of the latest earthquake event, the elapsed time approached or exceeded the recurrence interval revealed from paleoearthquakes. Hence, we suggest that the northwestern corner of the Ordos Block has a significantly high seismic hazard potential and that the occurrence of a strong earthquake should not be underestimated. |
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| language | English |
| last_indexed | 2024-04-14T02:06:13Z |
| publishDate | 2022-08-01 |
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| series | Frontiers in Earth Science |
| spelling | doaj.art-c963ffc34777446393f9a0ab6e66483e2022-12-22T02:18:41ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-08-011010.3389/feart.2022.942242942242Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos BlockXingwang Liu0Xingwang Liu1Zemin Gao2Qiyun Lei3Yanxiu Shao4Yunsheng Yao5Yunsheng Yao6Gansu Lanzhou Geophysics National Observation and Research Station, Lanzhou, ChinaLanzhou Institute of Geotechnique and Earthquake, China Earthquake Administration, Lanzhou, ChinaFaculty of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu, ChinaEarthquake Agency of Ningxi Hui Autonomous Region, Yinchuan, ChinaInstitute of Surface-Earth System Science, Tianjin University, Tianjin, ChinaGansu Lanzhou Geophysics National Observation and Research Station, Lanzhou, ChinaLanzhou Institute of Geotechnique and Earthquake, China Earthquake Administration, Lanzhou, ChinaThe Zhuozishan West Piedmont Fault (ZWPF) is an active normal fault in the northwestern corner of the Ordos Block. Studying the recurrence characteristics of paleoearthquakes is useful for understanding the regional seismic hazard potential. In this study, paleoseismic trench and optically stimulated luminescence (OSL) dating methods are used to determine the temporal sequence of paleoearthquakes. Severn earthquakes were constrained to be E7 (73.4 ± 12.9 ka to 75.3 ± 10.6 ka), E6, (63.7 ± 7.4 ka to 64.4 ± 8.2 ka), E5 (53.2 ± 7.0 ka to 58.7 ± 6.5 ka), E4 (42.6 ± 6.3 ka to 47.7 ± 5.8 ka), E3 (31.0–3.4 ka to 31.3 ± 3.4 ka), E2 (26.1 ± 2.7 ka to 28.1 ± 3.8 ka) and E1 (15.8 ± 1.9 ka to 20.2 ± 2.6 ka). The recurrence interval of strong earthquakes in the ZWPF is roughly constrained to be 8.1–14 ka, with magnitudes of Mw 7.0–7.4 that ruptured the entire fault. Based on the timing of the latest earthquake event, the elapsed time approached or exceeded the recurrence interval revealed from paleoearthquakes. Hence, we suggest that the northwestern corner of the Ordos Block has a significantly high seismic hazard potential and that the occurrence of a strong earthquake should not be underestimated.https://www.frontiersin.org/articles/10.3389/feart.2022.942242/fullzhuozishan west piedmont faultordos blocknormal faultpaleoseismic eventseismic hazard |
| spellingShingle | Xingwang Liu Xingwang Liu Zemin Gao Qiyun Lei Yanxiu Shao Yunsheng Yao Yunsheng Yao Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos Block Frontiers in Earth Science zhuozishan west piedmont fault ordos block normal fault paleoseismic event seismic hazard |
| title | Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos Block |
| title_full | Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos Block |
| title_fullStr | Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos Block |
| title_full_unstemmed | Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos Block |
| title_short | Timing of Paleoearthquakes and Seismic Hazard of the Zhuozishan West Piedmont Fault in the Northwestern Ordos Block |
| title_sort | timing of paleoearthquakes and seismic hazard of the zhuozishan west piedmont fault in the northwestern ordos block |
| topic | zhuozishan west piedmont fault ordos block normal fault paleoseismic event seismic hazard |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.942242/full |
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