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Lu M.-Y.,China Center for Earthquake Disaster Emergency and SAR | Huang B.-S.,China Center for Earthquake Disaster Emergency and SAR | Liu T.-H.,China Center for Earthquake Disaster Emergency and SAR | Shao Y.-X.,China Earthquake Administration | And 4 more authors.
Earthquake | Year: 2011

The first movement to establish cross-fault deformation monitoring network began in the Capital Area of China in the late 1960s, mainly laid in a large area around Beijing, covering the main faulting zones. In the past 40 years, several strong earthquakes occurred in the metropolitan area, such as Tangshan M7.8 earthquake in 1976, Datong M6.1 earthquake in 1989, and Zhangbei M6.2 earthquake in 1998. First, we analysed the earthquake reflecting ability of cross-fault deformation observational data in the Capital Area of China, and discussed the earthquake monitoring capability of sites. The results show that: 69.64% cross-fault deformation observation data have better earthquake-reflecting ability on the strong earthquakes occurred, 75.00% monitoring sites have better earthquake monitoring capability on the strong earthquakes occurred, and can better capture the strong earthquake preparation, development, occurrence of precursory anomalies.


Lu M.-Y.,China Center for Earthquake Disaster Emergency and SAR | Fang Z.-F.,China Center for Earthquake Disaster Emergency and SAR | Zhao L.-K.,China Center for Earthquake Disaster Emergency and SAR
Earthquake | Year: 2010

Long-time observed data of Subsurface fluid from a wide circumferential region of the Wenchuan Ms8. 0 epicenter is analyzed before the earthquake. The result show that the subsurface fluids have long-time trend changes before the Wenchuan Ms8. 0 earthquake. The changes are characterized by earlier emerging time, wider range, compatibility and migration toward the epicenter etc. The shape of subsurface fluid long-time trend change is characterized by trend turn, annual variation damage and accelerating variation etc, mostly trend turns. Further comparative study with crustal deformation shows that the long-time trend change migration of subsurface fluid and crustal deformation is identical, and the long-time trend change time of crustal deformation is earlier than that of subsurface fluid. The tensor-pressure variation of crustal deformation is more closely related with the level variation of underground water, namely if the long-time trend change of crustal deformation is the majority variation shape of slow pressure or tensor diminution, then the long-time trend change shape of of underground water level is the majority variation shape of slow elevation or descending diminution. Finally, the productive mechanism on long-time trend change of subsurface fluid is discussed before Wenchuan Ms8. 0 earthquake .

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