Characteristics of Focal Mechanisms and the Stress Field in the Southeastern Margin of the Tibetan Plateau

Luo, Jun; Zhao, Chen; Lü, Jian; Zhou, Lianqing; Zheng, Sheng

doi:10.1007/s00024-016-1350-8

Cited by 15 publications

(2 citation statements)

References 63 publications

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“…S5 and S6). Substantially, the two solutions identically showed a stress setting similar to that in a broader region 33,34 .…”

Section: Comparison Of the Seismic Anisotropy With The Stress Fieldmentioning

confidence: 73%

Extracting the anisotropy information of crustal rocks from the seismological garbage

Zhang²,

Zhang³

et al. 2022

Preprint

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Human has been eagerly expecting to know some information that can indicate a large earthquake’s impending1,2,3,4,5. Decades of efforts showed that the impending of large earthquakes was usually accompanied by a process of regional weakening manifested with multiple temporal and spatial scaled deformation, and such a deformation was often accompanied by clusters or swarms of micro-earthquakes6, which further caused observable change in anisotropy of nearby rocks7,8,9,10. Here we show that the anisotropy information of crustal rocks may be extracted from the seismological garbage, the travel-time residuals produced by dense seismic stations which record clusters or swarms of micro-earthquakes, by means of a new concept, the slowness deviation tensor expressing 3-axis slowness anisotropy. In particular, we present a real example to justify that the slowness deviation tensor with arbitrarily inclined axis may be successfully extracted from the travel-time residual data, and meanwhile to demonstrate that this anisotropy reflected by the extracted tensor mainly originated from the local stress action or deformation. Undoubtedly, this work provides a completely new methodology to link the clusters or swarms of micro-earthquakes with the weakening process which occur before large earthquakes, which essentially contributes a promising direction toward the information that human has been expecting for.

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“…S5 and S6). Substantially, the two solutions identically showed a stress setting similar to that in a broader region 33,34 .…”

Section: Comparison Of the Seismic Anisotropy With The Stress Fieldmentioning

confidence: 73%

Extracting the anisotropy information of crustal rocks from the seismological garbage

Zhang²,

Zhang³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The maximum principal stress azimuth in the Zemuhe fault area roughly trends northwest‐southeast due to the southeast movement of the Sichuan–Yunnan block relative to the Tibetan Plateau (Figure 1e; Royden et al., 2008; Wen, Ma, et al., 2008). The focal mechanism results from small events around the Zemuhe fault area offer a poor constraint on the orientation, from approximately N40°W–N70°W (Cui et al., 2006; Luo et al., 2014; Ruan et al., 2011; W. Wu, 2020). GPS observations illustrate similar results (Y. Hu et al., 2020; Jiang et al., 2015; Zhu & Jiang, 2018).…”

Section: Models and Methodsmentioning

confidence: 99%

Estimation of the Nucleation Location and Rupture Extent of the 1850 Xichang, Sichuan, China, Earthquake by Dynamic Rupture Simulations on a Multi‐Segment Stepover Structure

Zhang

et al. 2023

Earth and Space Science

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We simulated the rupture dynamics and ground motion of the 1850 Xichang, China, earthquake on the Zemuhe fault, which consists of the Lijinbao segment, the Dajing segment, the Chechejie segment, and the Songxin segment, with the curved grid finite-difference method, and compared the simulation results with the field observed data and written records inferred data. We focused on the rupture extent of this earthquake and the effects of the maximum principal stress azimuth and nucleation location on the rupture process and the corresponding damage distribution. Numerical simulation results suggest that the regional maximum principal stress orientation that surrounds the Zemuhe fault was approximately N55°W, which is identical with the azimuth from the stress relief experiment in the neighboring area. Our simulations further imply that the nucleation location is under Lanbiluo. The simulation of this preferred nucleation location model suggests that the rupture propagated through the entire Dajing segment and the Chechejie segment, and the rupture gradually arrested at shallow depths after it transferred to the Lijinbao segment and the Songxin segment. Moreover, the simulation suggests that the rupture on the Chechejie segment was initiated at the surface and then mainly propagated downward due to the free surface effect. In addition, the Xichang earthquake may have exhibited a low rupture velocity on the Dajing segment. Furthermore, our simulation results emphasize the importance of the stepover width in the earthquake dynamics.

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The Menyuan, Qinghai MS6.9 Earthquake on January 8, 2022: A Strike-slip Cascading Rupture Event

Liang

Zhang³

et al. 2023

Pure Appl. Geophys.

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Characteristics of Focal Mechanisms and the Stress Field in the Southeastern Margin of the Tibetan Plateau

Cited by 15 publications

References 63 publications

Extracting the anisotropy information of crustal rocks from the seismological garbage

Extracting the anisotropy information of crustal rocks from the seismological garbage

Estimation of the Nucleation Location and Rupture Extent of the 1850 Xichang, Sichuan, China, Earthquake by Dynamic Rupture Simulations on a Multi‐Segment Stepover Structure

The Menyuan, Qinghai MS6.9 Earthquake on January 8, 2022: A Strike-slip Cascading Rupture Event

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