A new series of bits specifically developped is applied to drilling geophysical prospecting epicentre hole in stratum of bonding clay, sand clay, mantle rock, blue broad stone and river stone and so on in Mishan.

The development of earthquake source physics show that the engine of earthquake prediction is not only the advanced science and technology but the requirement o f the guidance of correct physics model that is of more important.

Ioffe Physical Technical Institute, Russian Academy of Science, came to China and cooperated with the Institute of Geophysics, CSB and the Institute of Geophysics, Scientific Academy of China to carry out the experimental investigation of rock rupture with scale of decimeters in the laboratories of earthquake source physics.