Constraining shear strength of fault damage zone using geodetic data and numerical simulation
Shear strength of damage zone, representing the stress threshold for rupture initiation, is a critical parameter in faulting mechanics. Despite its significance, the damage-zone's shear strength has not been estimated in natural earthquake ruptures. Here we employed coseismic deformation and st...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/179670 |
| _version_ | 1811696816587014144 |
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| author | Li, Chenglong Ma, Zhangfeng Xi, Xi Zhang, Guohong Shan, Xinjian |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Li, Chenglong Ma, Zhangfeng Xi, Xi Zhang, Guohong Shan, Xinjian |
| author_sort | Li, Chenglong |
| collection | NTU |
| description | Shear strength of damage zone, representing the stress threshold for rupture initiation, is a critical parameter in faulting mechanics. Despite its significance, the damage-zone's shear strength has not been estimated in natural earthquake ruptures. Here we employed coseismic deformation and strain, kinematic slip model, and finite element modeling to determine the elastic properties and peak shear stress of coseismic damage zones along the 2021 Mw 7.4 Maduo earthquake. Through the analysis of the lowest shear stress resulting in surface ruptures and the highest stress without surface rupture, we constrained the strength within a range of 7–17 MPa. Our result is consistent with strength (5–16 MPa) of sandstone samples from laboratory tests, demonstrating the validity of this estimation. Although factors such as fault maturity and confining pressure influence strength variation, the strength can directly reflect the stress threshold required for macroscopic surface rupture formation in fault damage zones dominated by sandstone. |
| first_indexed | 2024-10-01T07:45:23Z |
| format | Journal Article |
| id | ntu-10356/179670 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:45:23Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1796702024-08-20T15:36:26Z Constraining shear strength of fault damage zone using geodetic data and numerical simulation Li, Chenglong Ma, Zhangfeng Xi, Xi Zhang, Guohong Shan, Xinjian Earth Observatory of Singapore Earth and Environmental Sciences Earthquake event Shear strength Shear strength of damage zone, representing the stress threshold for rupture initiation, is a critical parameter in faulting mechanics. Despite its significance, the damage-zone's shear strength has not been estimated in natural earthquake ruptures. Here we employed coseismic deformation and strain, kinematic slip model, and finite element modeling to determine the elastic properties and peak shear stress of coseismic damage zones along the 2021 Mw 7.4 Maduo earthquake. Through the analysis of the lowest shear stress resulting in surface ruptures and the highest stress without surface rupture, we constrained the strength within a range of 7–17 MPa. Our result is consistent with strength (5–16 MPa) of sandstone samples from laboratory tests, demonstrating the validity of this estimation. Although factors such as fault maturity and confining pressure influence strength variation, the strength can directly reflect the stress threshold required for macroscopic surface rupture formation in fault damage zones dominated by sandstone. Published version This study is co-supported by the National Natural Science Foundation of China (Grant U2139202), the National Nonprofit Fundamental Research of Institute of Geology, China Earthquake Administration (Grant IGCEA2005), and by the China Scholarship Council scholarship (Grant 202204190006). 2024-08-14T07:50:49Z 2024-08-14T07:50:49Z 2024 Journal Article Li, C., Ma, Z., Xi, X., Zhang, G. & Shan, X. (2024). Constraining shear strength of fault damage zone using geodetic data and numerical simulation. Geophysical Research Letters, 51(10). https://dx.doi.org/10.1029/2024GL108169 0094-8276 https://hdl.handle.net/10356/179670 10.1029/2024GL108169 2-s2.0-85194478222 10 51 en Geophysical Research Letters © 2024 The Author(s). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. application/pdf |
| spellingShingle | Earth and Environmental Sciences Earthquake event Shear strength Li, Chenglong Ma, Zhangfeng Xi, Xi Zhang, Guohong Shan, Xinjian Constraining shear strength of fault damage zone using geodetic data and numerical simulation |
| title | Constraining shear strength of fault damage zone using geodetic data and numerical simulation |
| title_full | Constraining shear strength of fault damage zone using geodetic data and numerical simulation |
| title_fullStr | Constraining shear strength of fault damage zone using geodetic data and numerical simulation |
| title_full_unstemmed | Constraining shear strength of fault damage zone using geodetic data and numerical simulation |
| title_short | Constraining shear strength of fault damage zone using geodetic data and numerical simulation |
| title_sort | constraining shear strength of fault damage zone using geodetic data and numerical simulation |
| topic | Earth and Environmental Sciences Earthquake event Shear strength |
| url | https://hdl.handle.net/10356/179670 |
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