关键词: 地震测深, 震相, 地壳结构

Abstract: In this paper, We have studied the four(P_g,P_c,P_m and P_n)routine phases of DSS in North China and their implications for the structure and physical characters of the crust and upper man-tle. Those phases show the structural feature of the different lavers as well as the velocitv and the velocity gradient changes of both vertical and lateral direction. We have also researched the sin-gular phases and their specialities and important implication for the crustal structure. The singu-lar phases with anomaly of the appearent velocity,amplitude and appearing interval can be found in some profiles. The result indicate that the singular phases reflect the crustal structure anoma-lous characters related to the preparation of strong earthquake and mineral resoucres.

Key words: Seismic sounding, seismic phase, Crustal structure