PRELIMINARY STUDY OF ANCIENT STRESS FIELD IN WUDALIANCHI VOLCANIC REGION-BASED ON INVERSION OF CRATER MODEL

Research shows that regional stress field affects the distribution of volcanic dikes and craters. Normally, the arrangement of craters parallels to the direction of maximum horizontal principal stress and verticals to the minimum horizontal principal stress. Combining the foreign method of crater survey, this paper studys wudalianchi in heilongjiang province. In the basis of remote sensing images and volcanic data, this paper processes images, analyses volcanic structure diagram and processes linear mode of volcanic craters to inverse wudalianchi regional stress field. Result shows that wudalianchi maximum horizontal principal stress direction is NE.this result coincides with the stress direction information of focal mechanism solution. Abroad has conducted a comprehensive study of the method, however the few domestic research. Inversion result demonstrates that the method is practical, so we can apply this method in the region of the domestic typical volcanoes to compensate regional stress direction information