Geodetic measurement of crustal motion in southwest China

King, Robert W.; Shen, Feng; Burchfiel, B. C.; Royden, L.; Wang, Erchie; Chen, Zhiliang; Liu, Yuping; Zhang, Xuan-Yang; Zhao, Ji-Xiang; Yu-lin, LI

doi:10.1130/0091-7613(1997)025<0179:gmocmi>2.3.co;2

Cited by 219 publications

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“…The NW-trending crustal shortening rate across the Longmenshan thrust belt is inferred by geological study to be 10 mm/a [14], and the balance geological cross-section shows that its total crustal shortening amount is as high as 40%-60% [15]. GPS study demonstrates that the crustal shortening across the Longmenshan thrust belt is not significant, and its present rate is less than 3 mm/a [16][17][18][19][20][21], or about 7 mm/a in a 700-km wide range across the thrust belt [22]. Two end-member models for the Qinghai-Tibetan Plateau have also been proposed to explain the crustal and upper mantle deformation from a geo-scientific perspective, including a distributed continuous deformation and its revised channel flow model [17,18,23], and a block-like motion model along the localized mega-strike-slip faults [3, 24,25].…”

Section: Tectonic Setting In Briefmentioning

confidence: 99%

Lushan M S7.0 earthquake: A blind reserve-fault event

et al. 2013

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In the epicenter of the Lushan M S 7.0 earthquake there are several imbricate active reverse faults lying from northwest to southeast, namely the Gengda-Longdong, Yanjing-Wulong, Shuangshi-Dachuan and Dayi faults. Emergency field investigations have indicated that no apparent earthquake surface rupture zones were located along these active faults or their adjacent areas. Only brittle compressive ruptures in the cement-covered pavements can be seen in Shuangshi, Taiping, Longxing and Longmen Townships, and these ruptures show that a local crustal shortening occurred in the region during the earthquake. Combining spatial distribution of the relocated aftershocks and focal mechanism solutions, it is inferred that the Lushan earthquake is classified as a typical blind reverse-fault earthquake, and it is advised that the relevant departments should pay great attention to other historically un-ruptured segments along the Longmenshan thrust belt and throughout its adjacent areas.Lushan earthquake, earthquake surface rupture zone, blind reverse-fault earthquake, Longmenshan thrust belt, Qinghai-Tibetan Plateau Citation:Xu X W, Wen X Z, Han Z J, et al. Lushan M S 7.0 earthquake: A blind reserve-fault event.

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Section: Tectonic Setting In Briefmentioning

confidence: 99%

Lushan M S7.0 earthquake: A blind reserve-fault event

et al. 2013

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“…Historically more than 12 strong earthquakes, with M [ 7.0, have occurred in this region. In order to study the crustal deformation and its process, global position system (GPS) stations were established throughout this region and results were obtained by several groups (e.g., King et al 1997;Chen et al 2000;Shen et al 2005;Gan et al 2007;Meng et al 2008;Liang et al 2013). Wang et al (2001) identified that the region south of Ganzi-Mani fault moves eastward relative to both Indian and Eurasian plates.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous strain regime in the eastern margin of Tibetan Plateau and its tectonic implications

Meng

et al. 2015

Earthq Sci

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The eastern margin of Tibetan Plateau is one of the most active zones of tectonic deformation and seismicity in China. To monitor strain buildup and benefit seismic risk assessment, we constructed 14 survey-mode global position system (GPS) stations throughout the northwest of Longmenshan fault. A new GPS field over 1999-2011 is derived from measurements of the newly built and pre-existing stations in this region. Sequentially, two strain rate fields, one preceding and the other following the 2008 M W 7.9 Wenchuan earthquake, are obtained using the Gausian weighting approach. Strain field over 1999-2007 shows distinct strain partitioning prior to the 2008 M W 7.9 Wenchuan earthquake, with compression spreading over around Longmenshan area. Strain field derived from the two measurements in 2009 and 2011 shows that the area around Longmenshan continues to be under striking compression, as the pattern preceding the Wenchuan earthquake, implying a causative factor of the sequent of 2013 M W 6.7 Lushan earthquake. Our GPSderived dilatation shows that both the Wenchuan and Lushan earthquakes occurred within the domain of pronounced contraction. The GPS velocities demonstrate that the Longriba fault underwent slight motion with the faultnormal and -parallel rates at 1.0 ± 2.5 mm and 0.3 ± 2.2 mm/a; the Longmenshan fault displayed slow activity, with a fault-normal rate at 0.8 ± 2.5 mm/a, and a fault-parallel rate at 1.8 ± 1.7 mm/a. Longriba fault is on a par with Longmenshan fault in strain partitioning to accommodate the southeastward motion of eastern margin of the Tibetan Plateau. Integrated analysis of principal strain tensors, mean principal stress, and fast directions of mantle anisotropy shows that west of Sichuan is characterized as mechanically strong crust-mantle coupling.

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“…Until now, it has been composed of more than 100 continuous and campaign GPS recording stations in that region. Previous results using satellite positioning have mainly revealed the interseismic horizontal velocity field within the seismogenic portion of the lithosphere of the Tibetan Plateau (King et al 1997;Chen et al 2000;Zhang et al 2004;Gan et al 2007). Research on vertical deformation is rare (an exception is Liang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…To the east, the southeast margin of the Tibetan Plateau moves laterally along the 2000 km Xianshuihe-Xiaojiang fault system (Molnar and Tapponnier 1975;Tapponnier et al 1986;Molnar and Dayem 2010). Several second-order blocks are also involved in this motion, which could make them move away from the collision front (King et al 1997;Chen et al 2000;Shen et al 2005; Fig. 1a).…”

Section: Introductionmentioning

confidence: 99%

“…With this exception the Gongga Mountain (7556 m) uplift and the Xiaoxiang-Ling range (4500 m) are also believed to have resulted from the E-W shortening . Some researchers believe that the eastward movement does not occur in the upper crust, but is mainly concentrated in the deeper middle and lower crusts (Southeast Tibet, e.g., King et al 1997;Schoenbohm et al 2006;andEast Tibet, e.g., Kirby et al 2000, 2008;Kirby and Ouimet 2011).…”

Section: Introductionmentioning

confidence: 99%

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GPS Strain Rate and Seismic Activity Before the Ludian Earthquake (Ms 6.5), Northeast Yunnan, China: New Implications for Eastward Chuan-Dian Block Extrusion

Su¹,

Wang²,

Wang³

et al. 2016

Terr. Atmos. Ocean. Sci.

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We characterized E-W shortening crustal deformation using GPS measurements and an earthquake focal mechanism solution to estimate conditions before the Ms 6.5 Ludian earthquake of 3 August 2014 (16:30, UTC+8). A series of NW-SE striking transpressive faults are distributed outside the Chuan-Dian Block. They accommodated the E-W shortening and N-S stretching in this region resulting from Chuan-Dian Block outward expansion. The displacement velocity field about the eastward, faultnormal slip rate and the vertical component are also examined. The results show that they share a similar rate change at the Anninghe, Zemuhe, Puxionghe, Jiaojihe, and Baogunao-Xiaohe faults. Among these faults, the maximum thrusting slip rate of the Baogunao-Xiaohe fault is less than 4 mm yr -1 . The slip rate change may represent a transition from lateral translation into a vertical thrusting movement. Furthermore, counterclockwise rotation also plays an important role in absorbing the E-W shortening. Relative to the inner zone, the outer Chuan-Dian Block together with the Daliang Shan fault zone represent the development of a new deformation area. A prediction could be made that the Daliang Shan fault zone will eventually replace the east boundary fault role of the Anninghe-Zemuhe-North Xiaojiang fault due to Chuan-Dian Block continuous outward expansion.

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Geodetic measurement of crustal motion in southwest China

Cited by 219 publications

References 0 publications

Lushan M S7.0 earthquake: A blind reserve-fault event

Lushan M S7.0 earthquake: A blind reserve-fault event

Heterogeneous strain regime in the eastern margin of Tibetan Plateau and its tectonic implications

GPS Strain Rate and Seismic Activity Before the Ludian Earthquake (Ms 6.5), Northeast Yunnan, China: New Implications for Eastward Chuan-Dian Block Extrusion

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