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《Chinese Journal of Geophysics》 2011-04
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Effect of stress ratio and friction coefficient on composite P wave radiation patterns

WAN Yong-Ge~(1,2),SHENG Shu-Zhong~(1,2),HSU Ya-Ju~3,WU Yih-Min~4 1 Institute of Disaster Prevention,Hebei Sanhe 065201,China 2 Institute of Geophysics,China Earthquake Administration,Beijing 10081,China 3 Institute of Earth Sciences,Academia Sinica,Taipei 115,Taizvan,China 4 Department of Geosciences,National Taiwan University,Taipei 10617 Taiwan,China  
In order to study the impact of stress ratio and friction coefficient on P-wave radiation patterns from a large number of earthquakes,we present how the shear stress,friction stress and Coulomb failure stress of the fault varies as a function of its orientation with respect to different stress ratios.The results show that the shear stress on the fault plane with various orientations indicates larger differences comparing to friction stress variations for different fault orientations. Assuming the spatial distribution of Coulomb failure stress is relevant to the P wave radiation pattern,and fault plane orientations are randomly distributed over the whole space,we superpose P wave radiation patterns from all fault orientations,and illustrate the characteristics of composite P wave radiation pattern in terms of different stress ratio and friction coefficient.We find that the stress ratio and friction coefficient both affect the composite P wave radiation pattern.To some extent,the shape of the composite P wave radiation can be changed by varying any of the two parameters,indicating the difficult to solve both of the parameters indepdently. However,if the friction coefficient can be determined by other methods,we can obtain a reasonable stress ratio by using P wave first motions.This work provides new idea to accurately determine stress field considering friction coefficient by large number of P first motion polarity data.
【Fund】: 国家自然科学基金项目(41074072 40874022);; 地震行业专项(200808053);; 中国地震局教师科研基金项目(20100101)资助
【CateGory Index】: P315
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