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The Research on Relationship between Seismic Strain and Oscillation of Groundwater in Wells-Aquifer System

Author: LiYue
Tutor: WangGuangCai
School: Chinese Geology University (Beijing)
Course: Groundwater Science and Engineering
Keywords: Solid Tide Effect Body strain Dislocation model
CLC: P315.723
Type: Master's thesis
Year: 2011
Downloads: 39
Quote: 1
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Abstract


Seismic crustal movement in the rock stress - strain accumulation and release of the results of the process of change in strain is the most direct characterization of seismic activity . Groundwater as one of the most active component of the earth's crust , universal mobility difficult compressibility characteristics equivalent to the high sensitivity of the body strain gauge , closed well confined aquifer wells - aquifer system . Groundwater the micro dynamic changes , underground stress state , the current tectonic movement and seismic activity clues and explore the earthquake precursors information . North China Block is the strongest areas of seismic activity in eastern mainland China , is also China 's key earthquake monitoring area . Ms6.2 earthquake occurred at 11:50 on January 10th 1998 in Hebei Province, Zhangbei County . The earthquake occurred in the areas of history and the present high level of seismic activity , is weak seismic activity zone once strong earthquake . Throughout the history of Zhangbei 6.2 earthquake , regional crustal strain caused by the earthquake , as well as strain and groundwater levels abnormal relationship is still small. Collected Zhangjiakou, North China Yanqing Wuliying , Changli He Jinjiazhuang , Xiaoyi 11 wells the water level of the whole point of the month before and after the earthquake in Zhangbei observations , using a polynomial fitting , digital filtering processing , the solid tide ingredient extracted water level . The calculated tidal factor and harmonic analysis , and then based on the relationship between the water level and body strain strain of anti performances aquifer . Then by the dislocation model simulated strain field in the area when the earthquake , the calculated crustal strain magnitude , and the inversion of values ??alignment analysis . The tidal effect of the well water level from the the M2 wave impact , along the fault zone spreading direction , volume strain change magnitude are quite different . Crustal strain in the region was a four-quadrant distribution and regional strain tensile strain an order of magnitude than the compression region . The method uses two types of body strain values ??coincide with each other , confirm each other , indicating that the the water level TIDE effect inversion of body strain feasible , its results have credibility .

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CLC: > Astronomy,Earth Sciences > Geophysics > Earth ( rock circles ) physics ( geophysics ) > Seismology > Seismic observation and forecasting > Earthquake precursors and earthquake mechanism > Groundwater dynamics and earthquake
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