Abstract:

According to the travel time data of P-arrivals recorded by seismic networks array along the Changbai Mountain and the permanent stations of Jilin Province, the 3D P-wave velocity structure of the crust and upper mantle down to 40 km depth beneath Changbai volcano and its adjacent areas (39°N-45°N, 122°E-130°E) is reconstructed by seismic tomography method. The result  shows that earthquake occurrence and distribution is focused on fault and other geological structures. We prove the existence of magma systems and guess that magma systems is located in the southwest of the crater, a depth of 10 to 40 km by three-dimension high resolution P-wave velocity structure in the crust and upper mantle. The presence and distribution of magma systems in the crust provides important evidence for further explaining and understanding of volcano activity.

Key words: Changbai Mountain, volcanoes, crust and upper mantle, seismic tomography, magma systems