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CHARACTERISTICS OF RECENT SEISMICITY AND STRESS FIELDS IN ANHUI SECTOR OF THE TAN-LU FAULT ZONE

Liu Dongwang Xia Ruiliang Liu Zemin Shen Xiaoqi Li Minli Yan Suping(Seismological Bureau of Anhui Province, Hefei 230031)  
The characteristics of recent earthquake activity in Anhui sector of the Tan-Lu fault zone was analyzed in this paper. Based on data of 99 moderate-small earthquakes along the fault, the focus mechanism was inversed by the method of maximum amplitude ratio of the first arrival wave in the Anhui local seismic network. According to these results and using statistics and focus mechanism systematic cluster analysis method,the characteristics of tectonic stress field and the focus fault rupture were quantitatively analyzed along the fault and its neighboring areas. The results showed that the recent earthquake activities in Anhui sector of the Tan-Lu fault zone inherited the historical seismic features in the space distribution, and the intensity of recent earthquakes did not show buildup trend. The superior azimuth of P axis and T axis in both the whole fault zone and the adjacent Anhui sector were about EW and NS, which meant that the effective recent force might be mainly near level or inclined, but there were other directional stress fields and near uprightness force. The focal fault rupture type was dip-slip or near dip-slip along the fault, and the type in the areas adjacent the fault was strike-slip or near strike-slip. There was a different character of stress fields in the northern and southern sub-sectors, namely, compression in the north and extension in the south. The dividing line is located at about 32° north latitude, with the NWW-striking Qiaotouji-Guandong fault being a structural transfer belt.
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