Deformation Response of Seismogenic Faults to the Wenchuan MS 8.0 Earthquake: A Case Study for the Southern Segment of the Longmenshan Fault Zone

Wu, Yanqiang; Jiang, Zhuoran; Liang, Hongbao; Pang, Yajin; Zhu, Shoubiao; Liu, Chang; Chen, Changyun; Li, Jingwei

doi:10.3390/rs10060894

Cited by 10 publications

(5 citation statements)

References 32 publications

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Section: Gps-derived Three-dimensional Velocitiessupporting

confidence: 78%

“…Along the XKF, the magnitude of extension reduces to about 40 nstrain/yr, and the azimuth of extension is different from that of other segments of the HYF. Along the LPSF, the magnitude of shortening was small, indicating insignificant strain accumulation near the fault and significant strain accumulation in a large area, quite similar to what was observed in the LMSF before the 2008 Wenchuan earthquake [48,49].…”

Section: Gps-derived Strain Ratessupporting

confidence: 62%

“…However, no significant differential motions were identified in the ORB. This deformation pattern across the LPS is similar with that observed across the LMSF before the 2008 Wenchuan MS 8.0 earthquake [48,49]. To qualitatively analyze the deformation process from the LXB to the ORB, we incorporated our velocities with the campaign-mode GPS velocities of Ye et al [47], which adopted the same data processing strategy with this study and the observational period being 1999-2017.…”

Section: Gps-derived Three-dimensional Velocitiesmentioning

confidence: 52%

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Crustal Deformation on the Northeastern Margin of the Tibetan Plateau from Continuous GPS Observations

Yao

et al. 2018

Remote Sensing

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We installed 10 continuous Global Positioning System (GPS) stations on the northeast margin of the Tibetan Plateau at the end of 2012, in order to qualitatively investigate strain accumulation across the Liupanshan Fault (LPSF). We integrated our newly built stations with 48 other existing GPS stations to provide new insights into three-dimensional tectonic deformation. We employed white plus flicker noise model as a statistical model to obtain realistic velocities and corresponding uncertainties in the ITRF2014 and Ordos-fixed reference frame. The total velocity decrease from northwest to southeast in the Longxi Block (LXB) was 5.3 mm/yr within the range of 200 km west of the LPSF on the horizontal component. The first-order characteristic of the vertical crustal deformation was uplift for the northeastern margin of the Tibetan Plateau. The uplift rates in the LXB and the Ordos Block (ORB) were 1.0 and 2.0 mm/yr, respectively. We adopted an improved spherical wavelet algorithm to invert for multiscale strain rates and rotation rates. Multiscale strain rates showed a complex crustal deformation pattern. A significant clockwise rotation of about 30 nradians/yr (10−9 radians/year) was identified around the Dingxi. Localized strain accumulation was determined around the intersectional region between the Haiyuan Fault (HYF) and the LPSF. The deformation pattern across the LFPS was similar to that of the Longmengshan Fault (LMSF) before the 2008 Wenchuan MS 8.0 earthquake. Furthermore, according to the distributed second invariant of strain rates at different spatial scale, strain partitioning has already spatially localized along the Xiaokou–Liupanshan–Longxian–Baoji fault belt (XLLBF). The tectonic deformation and localized strain buildup together with seismicity imply a high probability for a potential earthquake in this zone.

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Section: Gps-derived Three-dimensional Velocitiessupporting

confidence: 78%

Section: Gps-derived Strain Ratessupporting

confidence: 62%

Section: Gps-derived Three-dimensional Velocitiesmentioning

confidence: 52%

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Crustal Deformation on the Northeastern Margin of the Tibetan Plateau from Continuous GPS Observations

Yao

et al. 2018

Remote Sensing

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“…Large earthquakes can modulate the crustal deformation, stress eld, and strain accumulation of the surrounding faults (King et al, 1994;Stein, 2003;Nalbant and McCloskey, 2011;Wu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic changes in the crustal movement obtained via geodetic observations not only respond to the rupture process of great earthquakes but also re ect the seismogenic processes of strong earthquakes and the adjustment process after an earthquake, which is an essential information for determining the subsequent seismic potentials of large earthquakes (Jiang et al, 2009;Zou et al, 2015;Wu et al, 2018;Zhao et al, 2020). In this study, we focused on the dynamic deformation characteristics of the Xianshuihe Fault Zone using two periods of GPS observations and estimated the potential seismic hazards it poses.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Deformation And Fault Locking of The Xianshuihe Fault Zone, Southeastern Tibetan Plateau: Implications For Seismic Hazards

Li³

et al. 2021

Preprint

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The Xianshuihe Fault Zone is one of the most historically seismically active regions in mainland China. However, the seismicity along this fault zone has been quiescent for the past 40 years, since the Daofu M6.9 earthquake in 1981. Understanding its current deformation patterns and fault coupling characteristics is of great significance to estimate the potential risk of strong earthquakes. In this study, we analyzed the dynamic deformation and fault coupling characteristics along the Xianshuihe Fault Zone using Global Positioning System (GPS) data for 1999–2007 and 2016–2020. The results show that the deformation pattern of the Xianshuihe fault zone underwent a dynamic adjustment after the Wenchuan and Lushan earthquakes, i.e., the maximum shear strain accumulation rates of the Luhuo and Daofu sections significantly decreased from 6.0×10-8/a to 3.2×10-8/a, while that of the southeastern segment (i.e., Kangding and Moxi sections) increased from 4.5×10-8/a to 6.2×10-8/a. Additionally, the slip rate and deformation width of the Xianshuihe Fault Zone also changed during these two periods. Combined with the near-field cross-fault observation data, we suggest that the surrounding strong earthquakes 2008 Wenchuan Mw7.9 and 2013 Lushan Mw6.6 had evident differential impacts on the deformation pattern of the Xianshuihe Fault Zone. The fault-coupling inversion results show that the locking degree of the Xianshuihe Fault Zone continued to increase after the Mw7.9 Wenchuan and Mw6.6 Lushan earthquakes, especially the Qianning and Moxi sections increased significantly, with an average coupling coefficient of greater than 0.9 and left-lateral slip-rate deficits of ~5 mm/a and ~8 mm/a, respectively. In contrast, the locking degree of the Kangding section decreased with almost no slip-rate deficit, which may be due to the partial energy release caused by the Mw5.9 and Mw5.6 Kangding earthquakes in 2014. The analysis of the recent rupture history and strain accumulation characteristics of the Xianshuihe Fault Zone indicates that both the Qianning and Moxi sections have a high seismic potential for the next strong earthquake in the Xianshuihe Fault Zone.

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Oblique fault movement during the 2016 Mw 5.9 Zaduo earthquake: insights into regional tectonics of the Qiangtang block, Tibetan Plateau

Zhao

et al. 2020

J Seismol

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Deformation Response of Seismogenic Faults to the Wenchuan MS 8.0 Earthquake: A Case Study for the Southern Segment of the Longmenshan Fault Zone

Abstract: Abstract:The spatiotemporal deformation response of a seismogenic fault to a large earthquake is of great significance to understanding the nucleation and occurrence of the next strong earthquake.

Cited by 10 publications

References 32 publications

Crustal Deformation on the Northeastern Margin of the Tibetan Plateau from Continuous GPS Observations

Crustal Deformation on the Northeastern Margin of the Tibetan Plateau from Continuous GPS Observations

Dynamic Deformation And Fault Locking of The Xianshuihe Fault Zone, Southeastern Tibetan Plateau: Implications For Seismic Hazards

Oblique fault movement during the 2016 Mw 5.9 Zaduo earthquake: insights into regional tectonics of the Qiangtang block, Tibetan Plateau

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