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Earthquake prediction from China's mobile gravity data 被引量:13
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作者 Zhu Yiqing Liu Fang +3 位作者 you xinzhao Liang Weifeng Zhao Yunfeng Liu Lian 《Geodesy and Geodynamics》 2015年第2期81-90,共10页
The relation between plate tectonics and earthquake evolution is analyzed systematically on the basis of 1998-2010 absolute and relative gravity data from the Crustal Movement Observation Network of China. Most earthq... The relation between plate tectonics and earthquake evolution is analyzed systematically on the basis of 1998-2010 absolute and relative gravity data from the Crustal Movement Observation Network of China. Most earthquakes originated in the plate boundary or within the fault zone. Tectonic deformation was most intense and exhibited discontinuity within the tectonically active fault zone because of the differential movement; the stress accumulation produced an abrupt gravity change, which was further enhanced by the earthquake. The gravity data from China's Mainland since 2000 obviously reflected five major earthquakes (Ms 〉 7), all of which were better reflected than before 2000. Regional gravity anomalies and a gravity gradient change were observed in the area around the epicenter about 2 or 3 years before the earthquake occurred, suggesting that gravity change may be a seismic precursor. Furthermore, in this study, the medium-term predictions of the Ms7.3 Yutian, Ms8.0 Wenchuan, and Ms7.0 Lushan earthquakes are analytically pre- sented and evaluated, especially to estimate location of earthquake. 展开更多
关键词 Chinese mainland Gravity change Tectonic activity Seismic precursor Medium-term earthquake prediction Crustal Movement Observation Network of China (CMONC)
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Ionospheric total electron content disturbance associated with May 12, 2008,Wenchuan earthquake 被引量:3
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作者 Li Jianyong Meng Guojie +3 位作者 you xinzhao Zhang Rui Shi Hongbo Han Yufei 《Geodesy and Geodynamics》 2015年第2期126-134,共9页
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 glob... 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. 展开更多
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)
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Mathematical model for computing precise local tie vectors for CMONOC co-located GNSS/VLBI/SLR stations 被引量:1
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作者 Shen Yunzhong you xinzhao +4 位作者 Wang Jiexian Wu Bin Chen Junping Ma Xiaping Gong Xiuqiang 《Geodesy and Geodynamics》 2015年第1期1-6,共6页
The seven co-located sites of the Crustal Movement Observation Network of China(CMONOC) in Shanghai, Wuhan, Kunming, Beijing, Xi'an, Changchun, and Urumqi are equipped with Global Navigation Satellite System(GNSS... The seven co-located sites of the Crustal Movement Observation Network of China(CMONOC) in Shanghai, Wuhan, Kunming, Beijing, Xi'an, Changchun, and Urumqi are equipped with Global Navigation Satellite System(GNSS), very long baseline interferometry(VLBI), and satellite laser ranging(SLR) equipment. Co-location surveying of these sites was performed in 2012 and the accuracies of the solved tie vectors are approximately 5 mm.This paper proposes a mathematical model that handles the least squares adjustment of the 3D control network and calculates the tie vectors in one step, using all the available constraints in the adjustment. Using the new mathematical model, local tie vectors can be more precisely determined and their covariance more reasonably estimated. 展开更多
关键词 Co-located site Tie vector(TV) Reference point Global Navigation satellite system(GNSS) Very long baseline interferometry(VLBI)
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A precise velocity field of tectonic deformation in China as inferred from intensive GPS observations 被引量:26
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作者 LI Qiang you xinzhao +4 位作者 YANG ShaoMin DU RuiLin QIAO XueJun ZOU Rong WANG Qi 《Science China Earth Sciences》 SCIE EI CAS 2012年第5期695-698,共4页
Active tectonics, e.g., faulting, folding, and rifting are clearly manifested over the vast territory of China. The in-tensive crustal deformation with long-lived structures has given rise to numerous highly-elevated ... Active tectonics, e.g., faulting, folding, and rifting are clearly manifested over the vast territory of China. The in-tensive crustal deformation with long-lived structures has given rise to numerous highly-elevated mountains in the western China with the Yangtze and Yellow rivers downstreaming to the east,as well as resulting in catastrophicearthquakes with huge fatalities in the historical times. Quantifying crustal deformation into its amount, distribu- tion, and timing is prerequisite for an understanding of the nature of geological evolution, climate-tectonics interaction, and ultimately the geodynamic aspects that control these processes. Moreover, monitoring active deformation with great precision is of fundamental importance in trying to forecast earthquake or assess seismic hazard for an earth- quake-prone country like China. 展开更多
关键词 中国西部 构造变形场 GPS观测 速度场 地震危险性评估 密集 地球动力学 活动构造
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Recent rapid shortening of crust across the Tianshan Mts. and relative motion of tectonic blocks in the north and south 被引量:15
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作者 WANG Qi DING Guoyu +2 位作者 QIAO Xuejun WANG Xiaoqiang you xinzhao 《Chinese Science Bulletin》 SCIE EI CAS 2000年第21期1995-1999,共5页
Based on the multiple-epoch Global Positioning System observations during a period from 1992 to 1999, we document directly a rapid crustal shortening of -20 mm/a across the western Tianshan Mts. (76°E), in contra... Based on the multiple-epoch Global Positioning System observations during a period from 1992 to 1999, we document directly a rapid crustal shortening of -20 mm/a across the western Tianshan Mts. (76°E), in contrast to a 4 mm/a convergent rate across the eastern Tianshan Mts. (87°E) and the north-south convergence across the mountain belt descends laterally from west to east. The direction of current crustal movement inferred by GPS sites along the southern flank of the Tianshan Mts. is approximately perpendicular to the easterly-trending mountain belt, indicating that the Tarim Basin thrust almost rightly into the Tianshan Mts. The Tarim Basin accommodates nearly no or a minor, if any, crustal deformation and rotates clockwise, as a rigid body in a whole, at a rate of 0.64°/Ma around a Euler pole at 95.7° E, 40.3°N (Anxi, Gansu) with respect to the stable Siberia. The relative motion between the Kazakh platform and the Dzungarian Basin is quite apparent. The Dzungar should be regarded as an 展开更多
关键词 TIANSHAN Mts. CRUSTAL movement GPS.
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