华北地区人工地震测深震相与地壳结构研究

STUDY ON THE SEISMIC PHASE OF DSS NORTH CHINA

主要讨论了华北地区人工地震测深中的４个（Ｐ＿ｇ，Ｐ＿ｃ，Ｐ＿ｍ，Ｐ＿ｎ）常规震相以及它所反映的构造和物性特征，这些震相反映了地壳上地幔不同层位的构造形态以及速度和速度梯度结构在纵横向的变化。还重点研究了华北地区的奇异震相以及反映在构造上的特殊性和重要意义，一些剖面局部区域的某些震相显示在视速度、振幅和出现区间等方面的异常，反映了该区域在构造上的特殊性，而这些特殊性往往与地震的孕育、发生以及矿产资源的潜在构造背景有着密切的关系。

In this paper ， We have studied the four（P_g，P_c，P_m and P_n）routine phases of DSS in NorthChina 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 thevelocity 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 foundin 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.