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rupture model of the 2013 M_W 6.6 Lushan (China) earthquake constrained by a new GPS data set and its effects on potential seismic hazard

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Earthquake Science 2018年第3期31卷 117-125页

作者： Rumeng Guo Yong Zheng Faqi Diao Xiong Xiong Jiao Xu State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China Institute of Geophysics and Geomatics China University of Geosciences Wuhan 430074 China College of Earth Sciences University of Chinese Academy of Sciences Beijing 100049 China

Vertical records are critically important when determining the rupture model of an earthquake, especially a thrust earthquake. Due to the relatively low fitness level of near-field vertical displacements, the precision of previous rupture models is relatively low, and the seismic hazard evaluated thereafter should be further updated. In this study, we applied three-component displacement records from GPS stations in and around the source region of the 2013 MW6.6 Lushan earthquake to re-investigate the rupture *** improve the resolution of the rupture model, records from both continuous and campaign GPS stations were gathered, and secular deformations of the GPS movements were removed from the records of the campaign stations to ensure their reliability. The rupture model was derived by the steepest descent method（SDM）, which is based on a layered velocity structure. The peak slip value was about 0.75 m, with a seismic moment release of 9.89 × 1018 N·m, which was equivalent to an MW6.6 event. The inferred fault geometry coincided well with the aftershock distribution of the Lushan earthquake. Unlike previous rupture models, a secondary slip asperity existed at a shallow depth and even touched the ground surface. Based on the distribution of the co-seismic ruptures of the Lushan and Wenchuan earthquakes, post-seismic relaxation of the Wenchuan earthquake, and tectonic loading process, we proposed that the seismic hazard is quite high and still needs special attention in the seismic gap between the two earthquakes.

关键词： Lushan earthquake steepest descent method rupture model

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维普期刊数据库

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Rapid report of June 1,2022 M_(W) 5.9 Lushan earthquake,China with geodetic and teleseismic data

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Earthquake Research Advances 2023年第1期3卷 45-51页

作者： Lei Xie Nan Fang Xiaoge Liu Wenbin Xu The Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong KongChina Laboratory of Volcano and Earthquake Research School of Geosciences and Info-physicsCentral South UniversityChina

Timely response to earthquake characterization can facilitate earthquake emergency rescue and further scientific *** June 1,2022,M_(W) 5.9 earthquake occurred in the southern area of the Longmenshan fault *** event also happened at the south end of the Dayi seismic gap and is the largest earthquake that has occurred in this seismic gap since the 1970 M 6.2 *** slip-distribution model constrained by the seismic waveforms suggests a thrust-dominated faulting *** main slip occurs at a depth of~14 km,and the cumulative energy is released in the first 6 *** variations of Coulomb stress caused by the mainshock show a positive change in the southwest area of the Dayi seismic gap,indicating possible activation of future *** addition,we emphasize the importance of rapid estimation of deformation for near-field hazard delineation,especially when interferometric radar fails to image coseismic deformation in a high relief terrain.

关键词： Lushan earthquake Near real-time deformation estimates rupture model Dayi seismic gap

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维普期刊数据库

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The multi-stage rupture characteristics of 2015 Mw 7.2 Tajikistan earthquake in Pamir interior

The multi-stage rupture characteristics of 2015 Mw 7.2 Tajik...

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2019年中国地球科学联合学术年会

作者： Yunguo Chen Ping He Heqing Shi Qiang Yao Shuiping Li Qi Wang University of Science and Technology of China China University of Geosciences Hefei University Of Technology(Wuhan)

The 2015 Mw 7.2 Murghab, Tajikistan earthquake occurred on 7 December 2015 is the greater strike-slip earthquake documented by both the teleseismic waveforms and InSAR LOS displacements that attacked on the Sarez-Karakul fault zone, which is a major SW-NE trending sinistral strike-slip, transtensional fault that extends from south of Sarez Lake to north of Karakul lake. Combining near-field geodetic observations and seismic waveforms from global seismology network can provide detailed information about earthquake ruptures in remote regions of the Pamir Plateau. Here, our paper use the lineof-sight displacements from ALOS-2 and Sentinel-1 radar interferometry data combined with two series of tele-seismic data from European Union(30° model(slip distribution and rupture process) of the 2015 Tajikistan event. Our results show that the length of the main rupture zone is up to 100 km and its slip reaches to the surface of fault patches from ～30 km depth. The average slip is about 3.0 m and its area is in size of the 100 km × 15 km in length and width. The geodetic moment is up to 1.125 × 10^20 N?m, equivalent with a Mw 7.31.

关键词： 2015 Mw Tajikistan Pamir Plateau Fault geometry Slip distribution rupture model

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