Historical pattern and behavior of earthquake ruptures along the eastern boundary of the Sichuan-Yunnan faulted-block, southwestern China

Xu, Wen; Ma, Shuping; Xu, Xiwei; He, Yong-nian

doi:10.1016/j.pepi.2008.04.013

Cited by 231 publications

(228 citation statements)

References 25 publications

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“…Five major faults exist in western Sichuan Province, named the LMSF, Minjiang fault (MJF), Xianshuihe fault (XSHF), Anninghe fault (ANHF), and Zemuhe fault (ZMHF) ( Fig. 1) (Tang and Han 1993;Wen et al 2008). The LMSF zone with a NE strike began to develop in the Triassic period.…”

Section: Seismogeological Settingmentioning

confidence: 99%

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Hot Spring Gas Geochemistry in Western Sichuan Province, China After the Wenchuan Ms 8.0 Earthquake

Zhou¹,

Wang²,

Chen³

et al. 2015

Terr. Atmos. Ocean. Sci.

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The chemical components, He, Ne, and C isotropic ratios of gas samples collected thrice from 32 hot springs in western Sichuan Province, southwestern China in June and October 2008 and June 2009 were investigated in order to discuss the relationship between hot spring gas geochemistry and the Wenchuan Ms 8.0 earthquake. The data showed that the 3 He/ 4 He and C 13CO2 d values in spring gases in the Longmenshan fault (LMSF), Xianshuihe fault (XSHF), and Minjiang fault (MJF) zones increased obviously after the great earthquake. It was estimated that up to 62% of mantle helium contributed to the spring gas in the Kangding region based on the maximum 3 He/ 4 He (7.42 × 10 -6 ) in June 2008. Over time the mantle derived fluid contribution to the hot springs gradually decreased, but the crustal gas components: CO 2 and CH 4 derived from organic matter and radiogenic He increased. The gas geochemical data suggested that more mantle fluids migrated into the crust in western Sichuan Province after the Wenchuan Ms 8.0 earthquake.

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Section: Seismogeological Settingmentioning

confidence: 99%

“…5, 1954Litang Ms 7.2, 1955Kangding M 7.5, 1967Zhuwei Ms 6.8, 1973Luhuo Ms 7.9, 1976Songpan Ms 7.2, 1981Daofu Ms 6.9, 2008 Wenchuan Ms 8.0 ones and 2013 Lushan Ms 7.0 earthquakes (Wen et al 2008).…”

Section: Seismogeological Settingmentioning

confidence: 99%

Hot Spring Gas Geochemistry in Western Sichuan Province, China After the Wenchuan Ms 8.0 Earthquake

Zhou¹,

Wang²,

Chen³

et al. 2015

Terr. Atmos. Ocean. Sci.

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show abstract

“…GZ-F, the Garze fault; XSH-F, the Xianshuihe fault; LMS-F, the Longmenshan fault; MJ-F, the Minjiang fault length (Fig. 1) (Wen 1989(Wen , 2000Wen et al 2008;Allen et al 1991;Xu et al 2003;Cheng et al 2011a). Since 1700, almost all the segments of the fault have been ruptured by strong earthquakes, including the Luhuo M S 7.6 earthquake in 1973, the Renda M7.3 earthquake in 1923, the Daofu M7.0 earthquake in 1904, the Qianning M7.0 earthquake in 1893, the Kangding M7.0 earthquake in 1725, the Kangding M7.5 earthquake in 1955, and the M7.8 Kangding earthquake in 1786, with the 40 km length northern segment of the Selaha fault, not struck by considerable earthquake.…”

Section: Tectonic Setting Of Xianshuihe Fault and Historical Earthquakesmentioning

confidence: 99%

“…The Selaha fault segment is in the section where the Xianshuihe fault is consisted by three fault branches, the Selaha fault, the Yalahe fault, and the Zheduotang fault. The Yalahe fault is stuck by an M6-7 earthquake in 1700, while the southern segment of Selaha fault and the Zheduotang fault was ruptured by the Kangding M7.0 earthquake in 1725 and the Kangding M7.5 earthquake in 1955, respectively (Wen 2000;Wen et al 2008;Cheng et al 2011a).…”

Section: Tectonic Setting Of Xianshuihe Fault and Historical Earthquakesmentioning

confidence: 99%

“…Since 1700, almost all the segments of the Xianshuihe fault have been ruptured by the strong earthquake larger than M7.0 (Wen et al 2008;Cheng et al 2011a). Especially since the M7 1 / 4 earthquake in 1893, six earthquakes with magnitude larger or near 7.0 ruptured the Xianshuihe fault, among which the M7.0 earthquake in 1904 and M S 6.9 earthquake on the same fault segment (Fig.…”

Section: Coulomb Failure Stress Change Of the Historical Earthquakesmentioning

confidence: 99%

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The Kangding earthquake swarm of November, 2014

et al. 2015

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There was an earthquake swarm of two major events of M S 6.3 and M S 5.8 on the Xianshuihe fault in November, 2014. The two major earthquakes are both strike-slip events with aftershock zone along NW direction. We have analyzed the characteristics of this earthquake sequence. The b value and the h value show the significant variations in different periods before and after the M S 5.8 earthquake. Based on the data of historical earthquakes, we also illustrated the moderate-strong seismic activity on the Xianshuihe fault. The Kangding earthquake swarm manifests the seismic activity on Xianshuihe fault may be in the late seismic active period. The occurrence of the Kangding earthquake may be an adjustment of the strong earthquakes on the Xianshuihe fault. The Coulomb failure stress changes caused by the historical earthquakes were also given in this article. The results indicate that the earthquake swarm was encouraged by the historical earthquakes since 1893, especially by the M S 7.5 Kangding earthquake in 1955. The Coulomb failure stress changes also shows the subsequent M S 5.8 earthquake was triggered by the M S 6.3 earthquake.

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Geodetic imaging of potential seismogenic asperities on the Xianshuihe‐Anninghe‐Zemuhe fault system, southwest China, with a new 3‐D viscoelastic interseismic coupling model

Jiang

Chen

et al. 2015

JGR Solid Earth

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We use GPS and interferometric synthetic aperture radar (InSAR) measurements to image the spatial variation of interseismic coupling on the Xianshuihe-Anninghe-Zemuhe (XAZ) fault system. A new 3-D viscoelastic interseismic deformation model is developed to infer the rotation and strain rates of blocks, postseismic viscoelastic relaxation, and interseismic slip deficit on the fault surface discretized with triangular dislocation patches. The inversions of synthetic data show that the optimal weight ratio and smoothing factor are both 1. The successive joint inversions of geodetic data with different viscosities reveal six potential fully coupled asperities on the XAZ fault system. Among them, the potential asperity between Shimian and Mianning, which does not exist in the case of 10 19 Pa s, is confirmed by the published microearthquake depth profile.Besides, there is another potential partially coupled asperity between Daofu and Kangding with a length scale up to 140 km. All these asperity sizes are larger than the minimum resolvable wavelength. The minimum and maximum slip deficit rates near the Moxi town are 7.0 and 12.7 mm/yr, respectively. Different viscosities have little influence on the roughness of the slip deficit rate distribution and the fitting residuals, which probably suggests that our observations cannot provide a good constraint on the viscosity of the middle lower crust. The calculation of seismic moment accumulation on each segment indicates that the Songlinkou-Selaha (S4), Shimian-Mianning (S7), and Mianning-Xichang (S8) segments are very close to the rupture of characteristic earthquakes. However, the confidence level is confined by sparse near-fault observations.

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Historical pattern and behavior of earthquake ruptures along the eastern boundary of the Sichuan-Yunnan faulted-block, southwestern China

Cited by 231 publications

References 25 publications

Hot Spring Gas Geochemistry in Western Sichuan Province, China After the Wenchuan Ms 8.0 Earthquake

Hot Spring Gas Geochemistry in Western Sichuan Province, China After the Wenchuan Ms 8.0 Earthquake

The Kangding earthquake swarm of November, 2014

Geodetic imaging of potential seismogenic asperities on the Xianshuihe‐Anninghe‐Zemuhe fault system, southwest China, with a new 3‐D viscoelastic interseismic coupling model

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