Analysis on small-earthquake composite fault plane solutions from 1961 to 1999 in Xinfengjiang reservoir area.

To understand the earthquake characteristics in Xinfengjiang (XFJ for short) reservoir area, we collected the small earthquakes occurred in the area from 1961 to 1999. We segmented this 40-year period, parted the research region and calculated the composite fault plane solution of each block, discussed the effect characteristics of stress field of water pressure using Mohr’s stress circle. The final result shows that the main rupture pattern was very different before and after the M=6.1 main shock, changing from strike slip to normal rupture. The maximum principal stress axes of composite fault plane solutions are characterized by synchronous change with water level. [ABSTRACT FROM AUTHOR]

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