ISOTHERMAL SURFACE OF CURIE TEMPERATURE AROUND THE BEIJING AREA AND ITS RELATION TO EARTHQUAKES
HAO SHU-JIAN GAO HUA-GEN WANG CIIUN-HUA (Institute of Geology, State Seismological Bureau)
The paper studies the spatial variation of the Curie point isotherms in Beijing-Tianjin-Tanshan area with the help of aeromagnetic data. The depth of this isothermal surface in different regions changes from 16 km to 26 km below sea level. It is shallower than those in the tectonic regions in other parts of China. It was found that the stress due to the difference of the temperature between two adjacent regions is very important for earthquake occurrence.