前言甘肃及邻近地区的震源大多分布于地壳中,为了了解震源在地壳深部的形成过程,研究有效的地震予报方法,要求弄清楚地壳的内部结构。60年代前后曾融生等用人工地震法,对甘肃及青海小部分地区的地壳进行过探测,得出柴达木盆地及甘肃部分地区的地壳厚度为50—53公里,并指出该地区地壳中存在高速夹层[1,2]。1974年滕吉文等又对柴达木盆地提出 In order to understand the formation process of focal source in the deep part of the crust and to study the effective method of earthquake report, it is required to clarify the internal structure of crust. Before and after the 1960s, such as artificial earthquakes using artificial seismic method, a small part of Gansu and Qinghai, the crust was probed, found that parts of the Qaidam Basin and Gansu crust thickness of 50-53 km, and pointed out that the crust in the existence of high-speed Mezzanine [1,2]. In 1974, Teng Jiewen and others proposed to the Qaidam Basin