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Liu W.-Y.,Second Crust Monitoring and Application Center
Earthquake | Year: 2012

Prof. Chen Xinlian devoted himself into earthquake-related research and management from 1968.After spending over half of his life working in related fields, he has got great success and stands out as the initiator, founder and pioneer of the discipline of crustal deformation in China, and become an honored expert and famous scientist in dynamic geodesy. Prof. Chen is a key person with strategic vision and is good at top-design capability, he has also been a problem solver in the field of earthquake preparation and disaster mitigation. This paper reviews Prof. Chen's academic thoughts in learning and managing crustal deformation, earthquake-related policy and safety.

Zhang S.-X.,Second Crust Monitoring and Application Center | Zhang X.,Second Crust Monitoring and Application Center
Earthquake | Year: 2012

In order to investigate seismicity in the peripheral areas of the Ordos block after the 2008 Wenchuan earthquake, we analyzed evolutive course of the current vertical deformation in the Fenwei fault-depression zone using fault-crossing leveling data situated on different locations. The following are obtained: 1: The vertical movement extent of ascending and sinking difference is about 20 mm, and there is no obvious exceptional deformation; 2: Small earthquake activities may be transient instability of horizontal stress field of Ordos block, due to adjustment of compressional stress from Qinghai-Tibet plate and relative strengthening of compressional stress from North China sub-plate.

Yang C.,Changan University | Yang C.,Key Laboratory of Western China Mineral Resources and Geological Engineering | Zhang Q.,Changan University | Zhang Q.,Key Laboratory of Western China Mineral Resources and Geological Engineering | And 5 more authors.
Mining Science and Technology | Year: 2010

For harmful ground collapse and its special deformation characteristics, which causes SAR images to lose coherence, InSAR technology cannot be applied in monitoring surface collapse in mining areas. We took the Shenmu mining area in northern Shaanxi province as an example to study subsidence in mining areas and proposed an interpolated multi-view processing method. The results show that this method can improve the detectable deformation gradient to a certain extent and can become a good reference value for monitoring large scale gradient deformation. We also analyzed the rules for temporal decorrelation in mining. © 2010 China University of Mining and Technology.

Yang C.-S.,Changan University | Zhang Q.,Changan University | Zhao C.-Y.,Changan University | Wang Q.-L.,Second Crust Monitoring and Application Center | Ji L.-Y.,Second Crust Monitoring and Application Center
Journal of Geodynamics | Year: 2014

The Datong Basin is located to the north of the Fenwei Graben Basin, where ground fissures and subsidence are common geological hazards. The Datong Basin is also one of China's main energy bases and is known as "the hometown of coal". In this study, the small baseline subset InSAR technique was used to process 40 scenes of Envisat ASAR images that cover this area. The magnitude and distribution of subsidence in the Datong Basin were obtained. Additionally, the relationships among the regional land subsidence, ground fissures and fault activity were addressed. The results reveal that Datong ground subsidence is affected by the groundwater exploitation and the nearby faults. The Datong ground fissures are controlled by regional fault activity (e.g., seismic activity) and its interaction with the ground subsidence. Meanwhile, the influence of surface precipitation on ground fissure activity was analyzed. The differential subsidence on both sides of the ground fissures was also studied. © 2014 Elsevier Ltd.

Zhu Y.-Q.,Second Crust Monitoring and Application Center | Liu F.,Second Crust Monitoring and Application Center | Fu G.-Y.,Institute of Earthquake Science | Zhao Y.-F.,Second Crust Monitoring and Application Center
Earthquake | Year: 2012

Temporal-spatial evolution of gravity field before the Wenchun M S8.0 earthquake has been analyzed systematically by integrally adjusting the gravity observation data from the northeastern edge of the Tibetan Plateau. The results show that deep material of Tibetan Plateau moved northeastward after Wenchun M S8.0 earthquake, and some channels have been blocked by the Ordos block. Regional gravity field has changed significantly on a large spatial scale. After the Wenchun earthquake, gravity field changed non-uniformly between Liupanshan fault zone which borders land of Gan-Ning-Shan and the fault zone along the north edge of west Qinling mountains. This area has been affected by the Wenchun earthquake significantly.

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