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A new method for coseismic offset detection from GPS coordinate time series

Geodesy and Geodynamics 2023年第6期14卷 551-558页

作者： Zhiwei Yang Guangyu Xu Tengxu Zhang Mingkai Chen FeiWu Zhiping Chen School of Surveying and Geoinformation Engineering East China University of TechnologyNanchang 330013China Key Laboratory of Mine Environmental Monitoring and Improving around Poyang Lake of Ministry of Natural Resources East China University of TechnologyNanchang 330013China Key Laboratory for Digital Land and Resources of Jiangxi Province East China University of TechnologyNanchang 330013China Hubei Luojia Laboratory Wuhan 430079China College of Resources and Environmental Science and Engineering Hubei University of Science and TechnologyXianning 437100China

Currently,the extraction of coseismic offset signals primarily relies on earthquake catalog data to determine the occurrence time of *** is followed by the process of differencing the average GPS coordinate time series data,with a time interval of 3 to 5 days before and after the *** the face of the huge amount of GPS coordinate time series data today,the conventional approach of relying on earthquake catalog data to assist in obtaining coseismic offset signals has become increasingly *** address this problem,we propose a new method for automatically detecting coseismic offset signals in GPS coordinate time series without an extra earthquake catalog for ***,we pre-process the GPS coordinate time series data for filtering out stations with significant observations missing and detecting and removing ***,we eliminate other signals and errors in the GPS coordinate time series,such as trend and seasonal signals,leaving the coseismic offset signals as the primary *** resulting coordinate time series is then modeled using the first-order difference and data stacking *** modeling method enables automatic detection of the coseismic offset signals in the GPS coordinate time *** aforementioned method is applied to automatically detect coseismic offset signals using simulated data and the Searles Valley GPS data in California,*** results demonstrate the efficacy of our proposed method,successfully detecting coseismic offsets from vast amounts of GPS coordinate time series data.

关键词： GPS Coordinate time series coseismic offset Signal detection

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Detailed mapping of the surface rupture of the 12 February 2014 Yutian M_s7.3 earthquake,Altyn Tagh fault,Xinjiang,China

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Science China Earth Sciences 2021年第1期64卷 127-147页

作者： Zhaode YUAN Jing LIU-ZENG Xue LI Jing XU Wenqian YAO Longfei HAN Tao LI State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China School of Earth System Science Tianjin UniversityTianjin 300072China Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake AdministrationWuhan 430071China

Large-scale detailed mapping plays a key role in revealing the rupture characteristics and mechanisms of strong *** few studies have been performed on the surface ruptures of large earthquakes in central and western Tibet due to its remote nature and high *** on high-resolution unmanned aerial vehicle(UAV)photography,we mapped the coseismic surface rupture of the 2014 Yutian M_s7.3 *** the western Altyn Tagh fault system,the earthquake produced~37 km of surface rupture along the South Xor Kol fault(southern section S1),Xor Kol fault(central section S2)and Ashikule fault(northern section S3).Section S1 has a 16-km-long surface rupture with an average sinistral offset of 52±25 cm and a maximum offset of~90 cm,while section S3 has a 14.2-km-long surface rupture with an average sinistral offset of 36±21 cm and a maximum offset of~84 cm.A compilation of 5308 cracks yields an average crack width along the southern section of 85±71 cm and a maximum width of~700 cm;the average width along the central section is 39±21 cm,and the maximum width is 243 cm;and the average width along the northern section is 61±44 cm with a maximum of~340 *** addition,the average cumulative opening across rupture zone is 3.4±2.9 m along the southern section,with a maximum of~17 m;4.3±3.6 m along the central section,with a maximum of~13 m;and 1.7±1.6 m along the northern section,with a maximum of~6 ***,the average crack width and cumulative opening decrease towards bends and steps along the fault.A global synthesis of surface rupture distributions corresponding to strike-slip earthquakes indicates that the rupture zone is wider near the complex parts of fault geometries(such as bends,steps and fault bifurcations)than along straight sections,suggesting that the fault geometry has an obvious control on the surface rupture *** widespread cracks at the intersection between the Xor Kol and South Xor Kol faults may indicate that an extensional

关键词： Altyn Tagh fault Yutian earthquake coseismic surface rupture Gravity-driven slide coseismic offset Surface rupture width

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Paleoseismologic record of earthquakes along the Wuzunxiaoer section of the Altyn Tagh fault and its implication for cascade rupture behavior

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Science China Earth Sciences 2020年第1期63卷 93-107页

作者： Zhaode YUAN Jing LIU-ZENG You ZHOU Zhigang LI Heng WANG Wenqian YAO Longfei HAN State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China School of Earth Sciences and Engineering Sun Yat-Sen UniversityGuangzhou 510275China

The Altyn Tagh fault is one of the few great active strike-slip faults in the world. The recurrence characteristics of paleoearthquakes on this fault are still poorly understood due to the lack of paleoseismic records recorded in high-resolution strata. We document a paleoseismic record in a pull-apart basin along the Wuzunxiaoer section of the central Altyn Tagh *** high-resolution strata recorded abundant seismic deformations and their sedimentary responses. Four earthquakes are identified based on event evidence in the form of open fissures, thickened strata, angular unconformities, and folds. The occurrence times of the four events were constrained using radiocarbon dating. Event W1 occurred at AD1220–1773, events W2 and W3 occurred between 407 and 215 BC, and event W4 occurred slightly earlier at 1608–1462 BC, indicating clustered recurrence characteristics. A comparison of the earthquake records along the Wuzunxiaoer section with other records along the Xorkoli section suggests that both sections ruptured during the most recent event.

关键词： Tibet Altyn Tagh fault Strike-slip fault Paleoearthquake coseismic offset

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Parameters of coseismic Reverse- and Oblique-Slip Surface Ruptures of the 2008 Wenchuan Earthquake,Eastern Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2009年第4期83卷 673-684页

作者： XU Xiwei YU Guihua CHEN Guihua RAN Yongkang LI Chenxia CHEN Yuegau CHANG Chungpai Institute of Geology China Eathquake Administrative Beijing 100029 Department of Geosciences National Taiwan University Taipei Center for Space and Remote Sensing Research National Central University Jhongli Taipei

On May 12th, 2008, the Mw7.9 Wenchuan earthquake ruptured the Beichuan, Pengguan and Xiaoyudong faults simultaneously along the middle segment of the Longmenshan thrust belt at the eastern margin of the Tibetan plateau. Field investigations constrain the surface rupture pattern, length and offsets related to the Wenchuan earthquake. The Beichuan fault has a NE-trending rightlateral reverse rupture with a total length of 240 km. Reassessment yields a maximum vertical offset of 6.5±0.5 m and a maximum right-lateral offset of 4.9±0.5 m for its northern segment, which are the largest offsets found; the maximum vertical offset is 6.2±0.5 m for its southern segment. The Pengguan fault has a NE-trending pure reverse rupture about 72 km long with a maximum vertical offset of about 3.5 m. The Xiaoyudong fault has a NW-striking left-lateral reverse rupture about 7 km long between the Beichuan and Pengguan faults, with a maximum vertical offset of 3.4 m and left-lateral offset of 3.5 m. This pattern of multiple co-seismic surface ruptures is among the most complicated of recent great earthquakes and presents a much larger danger than if they ruptured individually. The rupture length is the longest for reverse faulting events ever reported.

关键词： surface rupture zone coseismic offset Wenchuan earthquake Longmenshan

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