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coseismic displacements and inospheric changes of the 2013 Ms7. 0 Lushan earthquake from GPS measurements

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Geodesy and Geodynamics 2013年第3期4卷 30-34页

作者： Cai Hua Zhao Guoqiang Key Laboratory of Earthquake Prediction China Earthquake Administration

By inverting GPS data recorded at stations of the Crustal Movement Observation Network of China （CMONOC） near the 2013 Lushan Ms7.0 earthquake, we found a horizontal displacement of 22 mm at a site about 32 kin SW of the epicenter and vertical displacements of as much as 12.4 mm at several sites. The vertical displacements were generally uplift on the west side of the nearby Longmenshan fault zone and subsidence on the east side. We also found coseismic ionospheric disturbances about 0.5 to 0.9 TECU in amplitude that lasted for about one hour.

关键词： GPS Ms7.0 Lushan earthquake CMONOC coseismic displacement coseismic ionospheric disturbances

Effects of Earth's curvature and radial heterogeneity in dislocation studies:Case studies of the 2008 Wenchuan earthquake and the 2004 Sumatra earthquake

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Earthquake Science 2010年第4期23卷 301-308页

作者： Guangyu Fu Wenke Sun Yoichi Fukuda Shanghua Gao Takashi Hasegawa Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Department of Geophysics Graduate School of Science Kyoto University Kyoto 606-8502 Japan Laboratory of Computational Geoclynamics Graduate University of Chinese Academy of Sciences Beijing 100049 China

Recently, effects of Earth＇s curvature and radial heterogeneity on coseismic deformations are often investi- gated based on the 2004 Sumatra earthquake. However, such effects are strongly related to earthquake types. As a low dip angle event, the 2004 Sumatra earthquake is not a good seismic case for such a topic since the effects for moderate dip angle events are much bigger. In this study, the half-space and spherical dislocation theories are used, respectively, to calculate co- seismic displacements caused by the 2008 Wenchuan earthquake and the 2004 Sumatra earthquake. Effects of Earth＇s curva- ture and stratification are investigated through the discrepancies of results calculated using the two dislocation theories. Re- sults show that the effects of Earth＇s curvature and stratification for the 2008 Wenchuan earthquake are much larger than those for the 2004 Sumatra earthquake. Ignoring the effects will cause errors up to 100%-200% in far field displacements for a moderate dip angle event like the 2008 Wenchuan earthquake. Such great effects are much bigger than those conclusions of previous studies. Besides, comparison with observations verifies that spherical dislocation theories yield better results than half-space ones in far fields.

关键词： coseismic displacement dislocation theory Earth model

Dynamic evolution of crustal horizontal deformation before the Ms6.4 Menyuan earthquake

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Geodesy and Geodynamics 2016年第4期7卷 253-260页

作者： Duxin Cui Shanlan Qin Wenping Wang The Second Monitoring and Application Center China Earthquake Administration

An Ms6.4 earthquake occurred in the Menyuan county of Qinghai Province on Jan 21, 2016. In order to recognize the development of horizontal deformation and distinguish precursory deformation anomalies, we obtained coordinates time series, velocity and strain model around the seismic zones from processing of continuous observations from 2010 and 6 times of surveying Global Positioning System （GPS） data since 2009. The results show that, before the earthquake, the eastern segmentation of the Qilian tectonic zone where the Lenglongling Fault located is in strong crustal shortening and compressional strain state with dilatational rates of -15 to -25 ppb. The Lenglongling Fault has a strike-slip rate of 3.1 mm/a and a far-field differential orthogonal rate of 7 mm/a, while differential rate is only 1.2 mm/a near the fault, which reflects its locking feature with strain energy accumulation and high seismic risks. Dynamic evolution of deformation model shows that preevent dilatational rates around the seismic zones increases from 15 ppb/a to -20 ppb/a with its center moving to the source areas. Time series of N components of G337 station, which is 13.7 km away from the Lenglongling Fault, exhibit a 5 mm/a acceleration anomaly. Time series of base-station QHME （in Menyuan） displays a reverse acceleration from the end of Sep. to Dec., 2016 when it comes to a largest deviation, and the accumulative displacement is more than 4 mm and the value reverse till the earthquake. In our results, coseismic displacement of N, E, U components in QHME site are 3.0 mm, 3.0 mm, -5.4 mm, respectively. If we profile these values onto the Lenglongling Fault, we can achieve a 1.1 mm of strike slip and 4.1 mm updip slip relative to the hanging wall.

关键词： Ms6.4 Menyuan earthquake Global Positioning System (GPS) Crustal horizontal motion Earthquake anomaly coseismic displacement Horizontal strain Slip rates of Lenglongling fault Hexi-Qilianshan area

The Study of Paleoearthquakes on the Weihe Fault Zone

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Earthquake Research in China 2008年第4期22卷 470-480页

作者： Shi Yaqin Feng Xijie Dai Wangqiang Ren Jun Li Xiaoni Dou Mali Earthquake Administration of Shaanxi Province Xi＇an 710068 China

It is indicated by historical records and the exploratory trench on the Weihe fault that the Yaodian-Zhangjiawan segment of the Weihe fault zone has experienced a historical earthquake and 3 paleoearthquake events in the past 9110a. The historical earthquake, namely, event Ⅳ, occurred between 1487 and 1568 AD. The date of paleoseismic event Ⅰ is （9110 ＋ 90） a, and the ages of events Ⅱ and Ⅲ are unknown. The coseismic vertical displacement of events Ⅰ, Ⅱ and Ⅲ is 0.5m, 0.5m and 0.2m, respectively. The exploratory trench also indicates that the Yaodian-Zhangjiawan segment of the Weihe fault was active in the Holocene.

关键词： Weihe fault zone Paleoearthquake coseismic displacement Exploratory trench Bilicun Village

Numerical Simulation on coseismic Effect of the November 14,2001 Great Kunlun Earthquake,Northern Tibet,China

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Earthquake Research in China 2008年第2期22卷 195-205页

作者： Wang Hui Zhang Guomin Zhang Huai Shi Yaolin Liu Jie Shen Xuhui Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Lab. of Computational Geodynamics Graduate University of Chinese Academy of Sciences Beijing 100049. China China Earthquake Networks Center China Earthquake Administration Beijing 100045 China

The November 14,2001 M_S8.1 Kunlun Mountains earthquake in northern Tibet is the largest earthquake occurring on the Chinese mainland since *** apply a three-dimensional(3-D)finite element numerical procedure to model the coseismic displacement and stress fields of the earthquake based on field *** then further investigate the stress interaction between the M_S8.1 earthquake and the intensive *** primary calculation shows that the coseismic displacement field is centralized around the east Kunlun fault *** the attenuation of coseismic displacements on the south side of Kunlun fault zone is larger than that on the north *** calculated coseismic stress field also indicates that the calculated maximal shear stress field is centralized around the east Kunlun fault zone;the directions of the coseismic major principal stress are opposite to that of the background crustal stress field of the Qinghai-Xizang(Tibet)*** indicates that the earthquake relaxes the crustal stress state in the Qinghai-Xizang(Tibet)***,we study the stress interaction between M_S8.1 earthquake and its intensive *** calculated Coulomb stress changes of the M_S8.1 great earthquake are in favor of triggering 4 aftershocks.

关键词： The Ms8.1 Kunlun Mountains earthquake coseismic displacement coseismic stress Numerical simulation

Effects of the MW 9.0 Tohoku Earthquake on GPS Position Time Series in China

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Effects of the MW 9.0 Tohoku Earthquake on GPS Position Time...