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Earthquake Science 2016年第5期29卷 271-279页

作者： Xu Cheng guojie meng Institute of Earthquake Science China Earthquake Administration

After Mw 7.8 Nepal earthquake occurred, the rearrangement of stresses in the crust commonly leads to subsequent damaging earthquakes. We present the calculations of the coseismic stress changes that resulted from the 25th April event using models of regional faults designed according to south Tibet-Nepal structure, and show that some indicative significant stress increases. We calculate static stress changes caused by the displacement of a fault on which dislocations happen and an earthquake occurs. A Mw 7.3 earthquake broke on 12 May at a distance of - 130 km SEE of the Mw 7.8 earthquake, whose focus roughly located on high Coulomb stress change （CSC） site. Aftershocks （first 15 days after the mainshock） are associated with stress increase zone caused by the main rupture. We set receiver faults with specified strikes, dips, and rakes, on which the stresses imparted by the source fault are resolved. Four group normal faults to the north of the Nepal earthquake seismogenic fault were set as receiver faults and variant results followed. We provide a discussion on Coulomb stress transfer for the seismogenic fault, which is useful to identify potential future rupture zones.

关键词： Coulomb stress changes Elastic model Stress transfer Earthquake risk Nepal earthquake

Introduction to the recently published treatise entitled A Guidebook to Earthquake Scientific Investigation

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Earthquake Research Advances 2023年第4期3卷 1-2页

作者： guojie meng Institute of Earthquake Forecasting China Earthquake AdministrationBeijingChina

Scienctific expedition of earthquake plays a crucial role in acquiring various data related to earthquake cycle processes and lays a fundamental foundation for further understanding earthquake preparation,seismic disaster,policy-making for earthquake disaster mitigation *** is an earthquake-prone country due to its seismically active environment,therefore Chinese government has been paying greatattention to earthquake scientific investigation.

关键词： earthquake disaster seismic

Investigation of ionospheric TEC changes related to the 2008 Wenchuan earthquake based on statistic analysis and signal detection

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Earthquake Science 2009年第5期22卷 545-553页

作者： Jianyong Li guojie meng Min Wang Hua Liao Xuhui Shen Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Earthquake Administration of Sichuan Province Chengdu 610041 China

Ionospheric TEC （total electron content） time series are derived from GPS measurements at 13 stations around the epicenter of the 2008 Wenchuan earthquake. Defining anomaly bounds for a sliding window by quartile and 2-standard deviation of TEC values, this paper analyzed the characteristics of ionospheric changes before and after the destructive event. The Neyman-Pearson signal detection method is employed to compute the probabilities of TEC abnormalities. Result shows that one week before the Wenchuan earthquake, ionospheric TEC over the epicenter and its vicinities displays obvious abnormal disturbances, most of which are positive anomalies. The largest TEC abnormal changes appeared on May 9, three days prior to the seismic event. Signal detection shows that the largest possibility ofTEC abnormity on May 9 is 50.74%, indicating that ionospheric abnormities three days before the main shock are likely related to the preparation process of the Ms8.0 Wenchuan earthquake.

关键词： GPS total electron content (TEC) earthquake precursor abnormal signals hypothesis test

Ionospheric total electron content disturbance associated with May 12, 2008,Wenchuan earthquake

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Geodesy and Geodynamics 2015年第2期6卷 126-134页

作者： Li Jianyong meng guojie You Xinzhao Zhang Rui Shi Hongbo Han Yufei National Earthquake Infrastructure Service State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences Institute of Earthquake Science China Earthquake Administration

Possible ionospheric disturbances relating to the May 12, 2008, MsS.0 Wenchuan earthquake were identified by Global Positioning System （GPS）-derived total electron content （TEC）, ion- osonde observations, the global ionospheric map （GIM）, and electron density profiles detected by the Constellation Observation System for Meteorology Ionosphere and Climate （COSMIC）. We applied a statistical test to detect anomalous TEC signals and found that a unique enhancement in TEC, recorded at 16 GPS stations, appeared on May 9, 2008. The critical fre- quency at F2 peak （foF2）, observed by the Chinese ionosondes, and maximal plasma frequency, derived from COSMIC data, revealed a characteristic similar to GPS TEC variations. The GIM showed that the anomalous variations of May 9 were located southeast of the epicenter. Using GPS data from 13 stations near the epicenter, we analyzed the TEC variations of satellite orbit traces during 04：00-11：00 UT. We found that TEC decreased to the east and increased to the southeast of the epicenter during this period. Results showed that the abnormal disturbance on May 9 was probably an ionosphenc precursor of the Wenchuan earthquake of May 12, 2008.

关键词： Ionospheric disturbance Global positioning system (GPS) Total electron content (TEC) Wenchuan earthquake Global ionospheric map (GIM) COSMIC f0F2 Crustal Movement Observation Network of China (CMONOC)

Anomalous crustal movements before great Wenchuan earthquake observed by GPS

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Geodesy and Geodynamics 2011年第2期2卷 13-22页

作者： Gu Guohua meng guojie Wang Wuxing Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

Studies of GPS data carried out before and after the great Wenchuan earthquake of Ms8.0 on May 12, 2008 show that anomalous crustal movements occurred before the earthquake. Data from 4 pre-earthquake observation sessions at a dense network of stations show that there were prominent broad-ranged long- and midterm anomalies in horizontal displacements and strain and in vertical displacements. Data from the fewer-numbered reference stations of continuous GPS observations since 1999 in West and South China showed short-term preseismic anomalies in horizontal displacements. The detection of co-seismic horizontal displacements at these stations supports the existence of the pre-earthquake anomalies. Results of single-epoch solutions of data from continuous-observation stations near the epicenter also show large imminent anomalies in vertical displacements. Although the Wenchuan earthquake was not predicted, these results give a strong indication that GPS should be the main observation technique for long-term, mid-term, short-term and imminent earthquake predictions.

关键词： Wenchuan earthquake earthquake prediction GPS crustal movement, horizontal displace- ment vertical displacement

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

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Earthquake Science 2015年第1期28卷 1-10页

作者： guojie meng Xiaoning Su Weiwei Wu Jinwei Ren Yonglin Yang Jicang Wu Chieh-Hung Chen Nikolay V.Shestakov Division of Earthquake Deformation Institute of Earthquake ScienceChina Earthquake Administration Key Laboratory of Earthquake Prediction Institute of Earthquake ScienceChina Earthquake Administration Engineering Institute of Surveying and Mapping Earthquake Administration of Sichuan Province Tongji University ‘‘National’’ Chung Cheng University Institute of Applied Mathematics Far Eastern Branch of Russian Academy of Sciences

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 MwT.9 Wenchuan earthquake, are obtained using the Gausian weighting approach. Strain field over 1999-2007 shows distinct strain partitioning prior to the 2008 MwT.9 Wenchuan earthquake, with compression spreading over around Longmenshan area. Strain fieldderived 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 Mw6.7 Lushan earthquake. Our GPSderived dilatation shows that both the Wenchuan and Lushan earthquakes occurred within the domain of pro- nounced contraction. The GPS velocities demonstrate that the Longriba fault underwent slight motion with the faultnormal and -parallel rates at 1.0 -4- 2.5 mm and 0.3 4-2.2 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 4- 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.

关键词： GPS measurement Longmenshan faultzone Longriba fault zone Tectonic deformation TibetanPlateau

GPS-constrained inversion of present-day slip rates along major faults of the Sichuan-Yunnan region, China

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Science China Earth Sciences 2008年第9期51卷 1267-1283页

作者： WANG YanZhao WANG EnNing SHEN ZhengKang WANG Min GAN WeiJun QIAO XueJun meng guojie LI TieMing TAO Wei YANG YongLin CHENG Jia LI Peng State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China Institute of Seismology China Earthquake AdministrationWuhan 430071China Survey Engineering Institute of Earthquake Administration of Sichuan Province Ya’an 625000China

A linked-fault-element model is employed to invert for contemporary slip rates along major active faults in the Sichuan-Yunnan region (96°-108°E, 21°-35°N) using the least squares method. The model is based on known fault geometry, and constrained by a GPS-derived horizontal velocity field. Our results support a model attributing the eastward extrusion of the Tibetan Plateau driven mainly by the north-northeastward indentation of the Indian plate into Tibet and the gravitational collapse of the plateau. Resisted by a relatively stable south China block, materials of the Sichuan-Yunnan region rotate clockwise around the eastern Himalayan tectonic syntaxis. During the process the Garzê-Yushu, Xianshuihe, Anninghe, Zemuhe, Daliangshan, and Xiaojiang faults, the southwest extension of the Xiaojiang fault, and the Daluo-Jinghong and Mae Chan faults constitute the northeast and east boundaries of the eastward extrusion, with their left slip rates being 0.3-14.7, 8.9-17.1, 5.1 ± 2.5, 2.8 ± 2.3, 7.1 ± 2.1, 9.4 ± 1.2, 10.1 ± 2.0, 7.3 ± 2.6, and 4.9 ± 3.0 mm/a respectively. The southwestern boundary consists of a widely distributed dextral transpressional zone other than a single fault. Right slip rates of 4.2 ± 1.3, 4.3 ± 1.1, and 8.5 ± 1.7 mm/a are detected across the Nanhua-Chuxiong-Jianshui, Wuliangshan, and Longling-Lancang faults. Crustal deformation across the Longmenshan fault is weak, with short-ening rates of 1.4 ± 1.0 and 1.6 ± 1.3 mm/a across the Baoxing-Beichuan and Beichuan-Qingchuan segments. Northwest of the Longmenshan fault lies an active deformation zone (the Longriba fault) with 5.1±1.2 mm/a right slip across. Relatively large slip rates are detected across a few faults within the Sichuan-Yunnan block: 4.4±1.3 mm/a left slip and 2.7±1.1 mm/a shortening across the Litang fault, and 2.7±2.3 mm/a right-lateral shearing and 6.7±2.3 mm/a shortening across the Yunongxi fault and its surrounding regions. In conclusion, we find that the Sichuan-Yunnan region is di

关键词： Sichuan-Yunnan region GPS linked-fault-element slip rate

Postseismic deformation of the M_S 8.1 Nepal earthquake in 2015 from GPS observations

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Postseismic deformation of the M_S 8.1 Nepal earthquake in 2...

Global crustal movement and tectonic plate boundary deformation constrained by the ITRF2008

第十一届中国卫星导航年会

作者： Xiaoning Su Lianbi Yao guojie meng College of Surveying and Geo-Informatics Tongji University Institute of Earthquake Forecasting China Earthquake Administration

On April 25,2015,the Nepal M_S 8.1 earthquake took place in the Himalayan seismic belt on the southern margin of Tibetan *** the earthquake,the China Earthquake Administration established Im

关键词： postseismic GPS emergency observation Bayesian framework logarithmic model exponential model multi-scale characteristics

来源： cnki会议 cnki会议 cnki会议评论

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Geodesy and Geodynamics 2012年第3期3卷 40-45页

作者： Zhu Ze meng guojie Su Xiaoning Wu Jicang Li Jean Xiaojing CEA Key Laboratory of Earthquake Prediction( Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Tongji University Shanghai 200092 China University of New South Wales Sydney NSW 2052 Australia

On the basis of the newly released International Terrestrial Reference Frame（ITRF2008） by the International Earth Rotation Service （IERS）, a new global plate model ITRF2008 plate for the major plates is established. This ITRF2008-derived model is analyzed in comparison with NNR-NUVEL1A model, which is mainly based on geological and geophysical data. The Eurasia and Paeifi6 plates display obvious differences in terms of the velocity fields derived from the two plate motion models. Plate acceleration is also introduced to characterize the differences of the two velocity fields which obtained from ITRF2008-plate and NNR-NUVEL1A models for major individual plates. The results show that the Africa, South America and Eurasia plates are undergoing acceleration, while the North America and Australia plates are in the state of deceleration motion

关键词： ITRF2008 crustal movement global plate model plate acceleration

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张北6.2级地震前的地壳形变特征

地震 1999年第3期19卷 261-266页

作者：孟国杰黎凯武中国地震局分析预报中心中国北京100036

介绍了１９９８年１月１０日张北６．２级地震前华北地区，主要是首都圈地区的地壳形变特征。分析了ＧＰＳ结果、跨断层形变观测以及定点台站观测的异常信息。认为张北地震前的地壳形变异常大部分是“场兆”异常；张北震中... 详细信息

介绍了１９９８年１月１０日张北６．２级地震前华北地区，主要是首都圈地区的地壳形变特征。分析了ＧＰＳ结果、跨断层形变观测以及定点台站观测的异常信息。认为张北地震前的地壳形变异常大部分是“场兆”异常；张北震中区在震前至少半年是处于形变闭锁阶段；地壳形变的前兆发展在总体上存在由东南向西北迁移特征。

关键词：地震预报地震前兆异常地壳形变张北地震