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前言 对于强震的地面地质条件及深部的构造背景已有不少学者进行过相当深入的研究,如[1,2]。可是,对界于它们两者之间,深度大约在10公里左右范围内的浅层构造条件与强震的关系问题,至今研究的人很少。据米雅奇金的研究结果,即使对于震源深度达到100公里的7.2级地震,其震前的波速异常区也仅仅在10—20公里的浅层地壳内出现。因此,若能同时研究强震的地壳表面、浅层和深部的构造条件,对地震预报及地震危险性估计无疑是有益的。同时还要看到,地下10公里以内也是石油部门人工地震勘探的深度。
Preface For many earthquakes in the geological conditions and deep tectonic background has been quite a lot of scholars have conducted in-depth research, such as [1,2]. However, there are few studies to date on the relationship between shallow tectonic conditions and strong earthquakes in the range of about 10 km between them. According to Miajachen’s research, even for the magnitude 7.2 earthquake with a focal depth of 100 km, the anomalous wave velocity anomalies before the earthquake occurred only in the shallow crust of 10-20 km. Therefore, if we can study the tectonic conditions of the crustal surface, shallow layer and deep part of strong earthquakes at the same time, it is undoubtedly beneficial to the prediction of earthquake and the seismic risk. At the same time, we should also see that the depth of artificial seismic exploration in the oil sector is also within 10 kilometers underground.