The earthquake in and around Shandong Province from 1975 to 2010 were corrected precisely to onset time of seismic phase and relocated by using Double-Difference （Hypodd） method and Hypoinvers 2000 （Hypo 2000 ）. The results show that the relocated seismicity is clearly associated with regional tectonics in space, and is also in agreement with the existence of deep faults imaged by wide-angle and deep seismic reflection profiling. Most earthquakes are located in a scope of 5 ~ 25kin, and there are two visible predominant depths： about 10kin and 16kin. We infer that they are in the bottom of the upper crust and in the middle crust respectively. The image of seismic activity indicated that moderately strong earthquakes occurred in the brittle-ductile transition. That is the effect of the deep tectonic dynamics under the area stress and the deformation of the upper and shallow fault movement.[著者文摘]