Application of the stress evolutionary model along the Xiaojiang fault zone in Yunnan Province, Southeast China

Paradisopoulou, Parthena; Garlaouni, Charikleia G.; Jin, Xin; Papadimitriou, Eleftheria; Karakostas, V.; Yang, Jialiang

doi:10.2478/s11600-007-0028-0

Cited by 14 publications

(12 citation statements)

References 21 publications

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“…ΔCFS = Coulomb Failure Stress; LMSF = Longmen Shan fault. Earthquake parameters were extracted from the following sources: A, Wen et al, 2008;B, Papadimitriou et al, 2004;C, Paradisopoulou et al, 2007;D, Molnar & Deng, 1984;E, Molnar & Lyon-Caent, 1989; F, Chen et al, 2013;G, Wang et al, 2015;H, Allen et al, 1991. In this research, we calculated the ΔCFS by considering the contributions from coseismic and postseismic stress change until 2008 caused by the historical earthquakes near and on the LMSF from 1725 to 2008. Assuming viscoelastic rheology in the LMSF area, we used the PSGRN/PSCMP code (Wang et al, , 2006 to calculate the earthquake stress caused by the dislocation sources in the layered lithospheric model.…”

Section: Methodsmentioning

confidence: 99%

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Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture

et al. 2018

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The 2008 Wenchuan earthquake (Mw 7.9) unilaterally ruptured the Longmen Shan fault (LMSF) along eastern Tibet. The earthquake rupture propagated about 270 km northeastward, whereas it propagated only about 20 km southwestward along the strike of the fault. Although a significant attention has been paid to the question of predominantly unilateral propagation, the primary reasons for this type of propagation remain unclear. In this research, we examined the change of Coulomb stress along the LMSF caused by the historical earthquakes near and on the LMSF from 1725 to 2008. We found that the 14 preceding large earthquakes (M ≥ 6.5) on the Xianshui He fault cast a stress shadow on the SW segment of the LMSF, which was not activated by the 2008 Wenchuan earthquake rupture. The 1970 Dayi earthquake on the SW segment of the LMSF contributed significantly to this stress shadow. Compared with the segment of the 2008 Wenchuan earthquake rupture, this stress shadow caused strong stress contrasts of −214, −22, and −80 kPa in the seismic gap of the very SW segment of the LMSF, the rupture zone of the 2013 Lushan earthquake, and the seismic gap between the 2008 Wenchuan and 2013 Lushan earthquake ruptures, respectively. Stress contrasts in these values were consistent with tectonic loading over 165, 17, and 62 years, respectively, by integrating an interseismic stress‐loading rate of 1.3 kPa/a. We proposed that this stress shadow might have created a barrier at the SW segment, preventing the earthquake rupture propagating southwestward.

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Section: Methodsmentioning

confidence: 99%

“…ΔCFS = Coulomb Failure Stress; LMSF = Longmen Shan fault. Earthquake parameters were extracted from the following sources: A, Wen et al, ; B, Papadimitriou et al, ; C, Paradisopoulou et al, ; D, Molnar & Deng, ; E, Molnar & Lyon‐Caent, ; F, Chen et al, ; G, Wang et al, ; H, Allen et al, .…”

Section: Geological Backgroundmentioning

confidence: 99%

Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture

et al. 2018

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“…indicates the references in Table 1 from which the related earthquake parameters were extracted. A: Wen et al (2008); B: Papadimitriou et al (2004); C: Paradisopoulou et al (2007); D: Molnar and Deng (1984); E: Molnar and Lyon‐Caent (1989); F: Shen et al (2009); G: Jiang et al (2014); H: Chen, Ran, et al (2013); I: Wang et al (2015); J: Wen et al (2008); K: Wang et al (2009); L: Li (1990); M: Gu et al (1983); N: Min et al (1995). Asterisk (*) refers to F for finite fault parameters.…”

Section: Historical Earthquakesmentioning

confidence: 99%

Do the Two Seismic Gaps in the Southwestern Section of the Longmen Shan Fault Present the Same Seismic Hazard?

Liu

Zhu

2020

JGR Solid Earth

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There are two seismic gaps in the southwestern section of the Longmen Shan Fault (LMSF): (1) the gap amid the ruptures of the 2008 Wenchuan and 2013 Lushan earthquakes and (2) the gap in the southwestern‐most section of the LMSF. Conflicting explanations have previously been proposed to estimate the hazards associated with these seismic gaps. In this study, we used a complete earthquake (M ≥ 6.0) catalogue for the past 300 years to re‐evaluate the seismic hazards by calculating the change in the Coulomb stress caused by nearby large earthquakes. When combined with the inter‐seismic tectonic stress loading process, our results suggest that there is a high possibility of a future earthquake in seismic gap 1 because of the enhanced stress caused by the 2008 Wenchuan and 2013 Lushan earthquakes, although the 1970 Dayi earthquake (Ms 6.2) did rupture the center of the gap. However, the risk of an earthquake occurring in seismic gap 2 has decreased due to the unloading stress triggered by 14 large historical earthquakes on the Xianshui He Fault. This indicates that the seismic hazards of the two gaps differ even though they are less than 35 km apart. These findings differ from the results of previous studies, which were obtained using earthquake‐induced stress modeling, inter‐seismic stress modeling, estimates of earthquake moment accumulation and release, and paleoearthquake analysis. Our research sheds new insights on seismic hazard estimates for the southwestern LMSF and might be helpful in determining the disaster relief distribution in Sichuan province, China.

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“…The active seismicity and well-documented long-term earthquakes record (at scale of several hundred years) of the XXFS (Allen et al, 1991;Wen et al, 2008) make the XXFS an ideal place to analyze earthquake triggering mechanism and the earthquake migration process. Previous works (e.g., Papadimitriou et al, 2004;Paradisopoulou et al, 2007) have proven the possibility of stress interaction on the XXFS. Assuming purely elastic behavior for the crust and upper mantle and taking into account the co-seismic slip of earthquakes together with the inter-seismic loading due to tectonic stress buildup, Papadimitriou et al (2004) and Paradisopoulou et al (2007) analyzed the stress evolution and found that all the strong earthquakes along the Xianshuihe-Xiaojiang fault occurred on the stress-enhanced fault segments.…”

Section: Introductionmentioning

confidence: 96%

Coulomb stress evolution along Xianshuihe–Xiaojiang Fault System since 1713 and its interaction with Wenchuan earthquake, May 12, 2008

Shan

Xiong

Wang

et al. 2013

Earth and Planetary Science Letters

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The curved left-lateral strike-slip Xianshuihe-Xiaojiang fault system (XXFS) in southwestern China extends at least 1400 km in the eastern margin of the Tibetan Plateau. Fieldworks confirm that the XXFS is one of the longest and most seismically active faults in China. The strain released by the slip motion on the XXFS is related to the convergence between the Indian and Eurasian plates. The entire fault system has experienced at least 35 earthquakes of M>6 in the recent 300 years and almost all segments of the system have been the locus of major historical earthquakes. Since the XXFS region is heavily populated (over 50 million people), understanding the migration of the large earthquakes in space and time is of crucial importance for the seismic hazard assessment in this region. We analyze a sequence of 25 earthquakes (M≥6.5) that occurred along the XXFS since 1713, and investigate their influence on the 2008 Mw7.9 Wenchuan earthquake occurred on the adjacent Longmenshan Fault. In our analysis, the relevant parameters for the earth crust are constrained by seismic studies. The locations and geometries of the earthquake faults as well as the rupture distributions are taken from field observations and seismological studies. Results from the Coulomb failure stress modeling indicate significant interactions among the earthquakes. After the 1713 earthquake, 19 out of 24 earthquakes occurred in the positive stress zone of the preceding earthquakes. The other 5 earthquakes located in the area without significant stress changes induced by the preceding events. In particular, we can identify 4 visible earthquake gaps with increasing seismic hazard along the XXFS, consistent with the findings from the paleo-seismological studies. The seismic activity and tectonic motion on the XXFS reduced the Coulomb stress accumulation at the hypocenter of 2008 Mw 7.9 Wenchuan earthquake, implying that the Wenchuan earthquake might not be triggered directly by the seismic activities on the XXFS. On the other hand, the Coulomb failure stress induced by the Wenchuan earthquake has increased in a region of 125-km-long segment of the XXFS, northwest of Kangding City.

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Application of the stress evolutionary model along the Xiaojiang fault zone in Yunnan Province, Southeast China

Cited by 14 publications

References 21 publications

Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture

Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture

Do the Two Seismic Gaps in the Southwestern Section of the Longmen Shan Fault Present the Same Seismic Hazard?

Coulomb stress evolution along Xianshuihe–Xiaojiang Fault System since 1713 and its interaction with Wenchuan earthquake, May 12, 2008

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