The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakes
The present-day stress field in the northwest Pacific Wadati-Benioff Zone (WBZ) has been investigated on the basis of earthquake focal mechanism catalog covering the period from 2012 to 2021. Our catalog contains 201 focal mechanism solutions (Mw 4.0–5.9) compiled from the F-net network along three...
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.1017632/full |
| _version_ | 1797955456611647488 |
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| author | Chengyu Liu Fangbin Liu Yin Cai Ran Ni Xiujie Xu Guoyi Li Weiduo Hao Zhaoyang Tian |
| author_facet | Chengyu Liu Fangbin Liu Yin Cai Ran Ni Xiujie Xu Guoyi Li Weiduo Hao Zhaoyang Tian |
| author_sort | Chengyu Liu |
| collection | DOAJ |
| description | The present-day stress field in the northwest Pacific Wadati-Benioff Zone (WBZ) has been investigated on the basis of earthquake focal mechanism catalog covering the period from 2012 to 2021. Our catalog contains 201 focal mechanism solutions (Mw 4.0–5.9) compiled from the F-net network along three profiles (southern Kurile trench, central Japan trench and northern Izu-Bonin trench). According to the spatial variations in the stress regimes, we outlined 12 subvolumes for three profiles. Our results present that the maximum compressive stress is, slab-normal in trench-outer rise regions and nearly strike-normal and sub-horizontal in the depth range 0–70 km. At intermediate depths, a two-planar stress pattern is observed (70–200 km) in southern Kurile and central Japan trench WBZ, with the maximum compressive stress closely parallel to the slab in upper plane and slab-normal in lower plane, respectively. However, the southern Kurile trench WBZ exposes an extension stress regime in 200–300 km depth range. At depths below 300 km, northern Izu-Bonin trench WBZ shows a stress regime of pure compression. We infer the dominant forces may be the slab blending in the shallow trench-outer rise regions, slab pull and ridge push at shallow depths, and the slab resistance provided by the mantle to the penetration of the slab at deep depths. Whereas the two-planar stress pattern may be caused by the unbending of the slab, and the unusual stress state along the junction of the trench WBZ at intermediate depths may be influenced by lateral deformation due to increasing slab’s dip. |
| first_indexed | 2024-04-10T23:33:26Z |
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| id | doaj.art-ee9cd14c35c241408fc9587c4f314fe3 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-10T23:33:26Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-ee9cd14c35c241408fc9587c4f314fe32023-01-12T04:25:28ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011010.3389/feart.2022.10176321017632The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakesChengyu Liu0Fangbin Liu1Yin Cai2Ran Ni3Xiujie Xu4Guoyi Li5Weiduo Hao6Zhaoyang Tian7Shandong Earthquake Agency, Ji’nan, ChinaKey Laboratory of Western China’s Environmental Systems, Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, ChinaShandong Earthquake Agency, Ji’nan, ChinaQilu Normal College, Ji’nan, ChinaShandong Earthquake Agency, Ji’nan, ChinaShandong Earthquake Agency, Ji’nan, ChinaDepartment of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, CanadaShandong Provincial Key Laboratory of Marine Environmental and Geology Engineering, Ocean University of China, Qingdao, ChinaThe present-day stress field in the northwest Pacific Wadati-Benioff Zone (WBZ) has been investigated on the basis of earthquake focal mechanism catalog covering the period from 2012 to 2021. Our catalog contains 201 focal mechanism solutions (Mw 4.0–5.9) compiled from the F-net network along three profiles (southern Kurile trench, central Japan trench and northern Izu-Bonin trench). According to the spatial variations in the stress regimes, we outlined 12 subvolumes for three profiles. Our results present that the maximum compressive stress is, slab-normal in trench-outer rise regions and nearly strike-normal and sub-horizontal in the depth range 0–70 km. At intermediate depths, a two-planar stress pattern is observed (70–200 km) in southern Kurile and central Japan trench WBZ, with the maximum compressive stress closely parallel to the slab in upper plane and slab-normal in lower plane, respectively. However, the southern Kurile trench WBZ exposes an extension stress regime in 200–300 km depth range. At depths below 300 km, northern Izu-Bonin trench WBZ shows a stress regime of pure compression. We infer the dominant forces may be the slab blending in the shallow trench-outer rise regions, slab pull and ridge push at shallow depths, and the slab resistance provided by the mantle to the penetration of the slab at deep depths. Whereas the two-planar stress pattern may be caused by the unbending of the slab, and the unusual stress state along the junction of the trench WBZ at intermediate depths may be influenced by lateral deformation due to increasing slab’s dip.https://www.frontiersin.org/articles/10.3389/feart.2022.1017632/fullfocal mechanismsWadati-Benioff zonestress fieldNorthwest Pacific plateF-net |
| spellingShingle | Chengyu Liu Fangbin Liu Yin Cai Ran Ni Xiujie Xu Guoyi Li Weiduo Hao Zhaoyang Tian The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakes Frontiers in Earth Science focal mechanisms Wadati-Benioff zone stress field Northwest Pacific plate F-net |
| title | The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakes |
| title_full | The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakes |
| title_fullStr | The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakes |
| title_full_unstemmed | The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakes |
| title_short | The present-day stress field along the Northwest Pacific Wadati-Benioff zone constrained by focal mechanisms of moderate earthquakes |
| title_sort | present day stress field along the northwest pacific wadati benioff zone constrained by focal mechanisms of moderate earthquakes |
| topic | focal mechanisms Wadati-Benioff zone stress field Northwest Pacific plate F-net |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.1017632/full |
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