Abstract
Based on the improved hydrofracturing method, the in-situ principal stresses are determined in the north, northeast, south and the northwest of China, and the results of many fault-plane solutions, crustal deformations, geological and geophysical observations are used to discuss the distribution of subcrustal stress in space, the difference between seismically active regions and stable regions, and the variations of the stress field near the source region before and after the Tangshan earthquake. Finally, the characteristics of intraplate tectonic stress fields in China are explained in relation with the combined actions of the movement of the major Indian Ocean, Pacific and Philippine Sea plates.
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