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本文利用重力资料用二度体正、反演法计算了东经120°以西的山东地区莫霍面深度,给出了认为比较可信的鲁中南地区奠霍面等深度图。在对比了本区地壳构造、地势、中生代以来的地质构造和地震之间的关系之后,发现了一些值得注意的关联现象。如环山地震带的存在,地震发生在地幔相对隆起区内部及其边缘,地震强度的分布与地幔隆起的幅度有对应关系,而地幔相对隆起区对应着地势上的相对低洼和中新生代的张性断陷盆地。用相对均衡异常计算方法,初步检验了莒县—郯城地幔局部隆起带处于正均衡异常状态。指出:地震与地幔的隆起作用有关,其强度与场所取决于地幔隆起作用的强度或隆起速度的差异程度。
In this paper, the depth of Moho in Shandong over 120 ° East longitude is calculated by gravity data using the second body forward and inversion method. The deepest maps of Luxembodiment in Luzhongnan area are given. After comparing the relationship between the crustal structure, topography and the geological structure and the earthquake since the Mesozoic, some noteworthy correlations were found. For example, the Huanshan seismic belt exists in the interior of the mantle and in the margin of the uplift, and the distribution of the earthquake intensity corresponds to the amplitude of the mantle uplift. The mantle relative uplift corresponds to the relatively low-lying and Mesozoic-Cenozoic Zhang fault basin. With the method of relative equilibrium anomaly calculation, the local uplift zone in Yixian-Yuncheng mantle is in a state of positive equilibrium anomaly. It is pointed out that the earthquake is related to the uplift of the mantle, and its intensity and location depend on the degree of difference in intensity or uplift velocity of the mantle uplift.