Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stability
The Namjag Barwa syntaxis is in the eastern Himalayan syntaxis area with the most intensive neotectonic activity. There are many late Quaternary active fault belts and strong seismicities. The tectonic stability of these active fault belts, such as the Jiali, Dongjiu-Milin, and Motuo fault belts, ma...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | zho |
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2022-12-01
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| Series: | Dizhi lixue xuebao |
| Subjects: | |
| Online Access: | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222820 |
| _version_ | 1811164977853104128 |
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| author | FENG Chengjun LI Bin LI Hui ZHOU Minghui ZHANG Peng ZHU Siyu REN Yazhe QI Bangshen WANG Miaomiao TAN Chengxuan CHEN Qunce |
| author_facet | FENG Chengjun LI Bin LI Hui ZHOU Minghui ZHANG Peng ZHU Siyu REN Yazhe QI Bangshen WANG Miaomiao TAN Chengxuan CHEN Qunce |
| author_sort | FENG Chengjun |
| collection | DOAJ |
| description | The Namjag Barwa syntaxis is in the eastern Himalayan syntaxis area with the most intensive neotectonic activity. There are many late Quaternary active fault belts and strong seismicities. The tectonic stability of these active fault belts, such as the Jiali, Dongjiu-Milin, and Motuo fault belts, may influence the project's construction. In-situ stress is a critical parameter for estimating regional tectonic stability. Currently, there is a lack of abundant in-situ stress results about the Namjag Barwa syntaxis. It is challenging to assess geological safety risks for major projects. Based on focal mechanism solutions, the paper reveals the orientation of the maximum principal stress surrounding the Namjag Barwa syntaxis using the stress tensor inversion method. According to the critical condition of fault instability, the magnitudes of principal stresses around the Namjag Barwa syntaxis are also estimated by combining the inversion of the stress shape ratio and the frictional coefficient. The results indicate that the maximum principal stress direction in the Namjag Barwa syntaxis area is NE-NNE. The maximum and minimum horizontal principal stresses increase linearly with depth at a gradient of 0.032~0.0355 MPa/m and 0.0227~0.0236 MPa/m, respectively. Heterogeneous features of the in-situ stress field still exist. Generally, the results estimated in this study are in good concordance with the in-situ stress measurements. They can provide reliable in-situ stress parameters for evaluating the tectonic stability in the Namcha Barwa region. |
| first_indexed | 2024-04-10T15:30:03Z |
| format | Article |
| id | doaj.art-4a2722823c1448b093075e770a51e920 |
| institution | Directory Open Access Journal |
| issn | 1006-6616 |
| language | zho |
| last_indexed | 2024-04-10T15:30:03Z |
| publishDate | 2022-12-01 |
| publisher | Institute of Geomechanics, Chinese Academy of Geological Sciences |
| record_format | Article |
| series | Dizhi lixue xuebao |
| spelling | doaj.art-4a2722823c1448b093075e770a51e9202023-02-14T01:15:04ZzhoInstitute of Geomechanics, Chinese Academy of Geological SciencesDizhi lixue xuebao1006-66162022-12-0128691993710.12090/j.issn.1006-6616.20222820dzlxxb-28-6-919Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stabilityFENG ChengjunLI BinLI Hui0ZHOU Minghui1ZHANG PengZHU SiyuREN YazheQI BangshenWANG Miaomiao2TAN ChengxuanCHEN QunceChina Geological Survey, Beijing 100037, ChinaHeze Earthquake Monitoring Center Station, Shandong Earthquake Agency, Heze 274020, Shandong, ChinaChang'an University, Xi'an 710064, Shaanxi, ChinaThe Namjag Barwa syntaxis is in the eastern Himalayan syntaxis area with the most intensive neotectonic activity. There are many late Quaternary active fault belts and strong seismicities. The tectonic stability of these active fault belts, such as the Jiali, Dongjiu-Milin, and Motuo fault belts, may influence the project's construction. In-situ stress is a critical parameter for estimating regional tectonic stability. Currently, there is a lack of abundant in-situ stress results about the Namjag Barwa syntaxis. It is challenging to assess geological safety risks for major projects. Based on focal mechanism solutions, the paper reveals the orientation of the maximum principal stress surrounding the Namjag Barwa syntaxis using the stress tensor inversion method. According to the critical condition of fault instability, the magnitudes of principal stresses around the Namjag Barwa syntaxis are also estimated by combining the inversion of the stress shape ratio and the frictional coefficient. The results indicate that the maximum principal stress direction in the Namjag Barwa syntaxis area is NE-NNE. The maximum and minimum horizontal principal stresses increase linearly with depth at a gradient of 0.032~0.0355 MPa/m and 0.0227~0.0236 MPa/m, respectively. Heterogeneous features of the in-situ stress field still exist. Generally, the results estimated in this study are in good concordance with the in-situ stress measurements. They can provide reliable in-situ stress parameters for evaluating the tectonic stability in the Namcha Barwa region.https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222820namcha barwain-situ stressfocal mechanics solutionstectonic stability |
| spellingShingle | FENG Chengjun LI Bin LI Hui ZHOU Minghui ZHANG Peng ZHU Siyu REN Yazhe QI Bangshen WANG Miaomiao TAN Chengxuan CHEN Qunce Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stability Dizhi lixue xuebao namcha barwa in-situ stress focal mechanics solutions tectonic stability |
| title | Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stability |
| title_full | Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stability |
| title_fullStr | Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stability |
| title_full_unstemmed | Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stability |
| title_short | Estimation of in-situ stress field surrounding the Namcha Barwa region and discussion on the tectonic stability |
| title_sort | estimation of in situ stress field surrounding the namcha barwa region and discussion on the tectonic stability |
| topic | namcha barwa in-situ stress focal mechanics solutions tectonic stability |
| url | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222820 |
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