鲁中、南应变场和地壳的最新运动

ON THE STRAIN FIELD AND RECENT CRUSTAL MOVEMENT OF CENTRAL AND SOUTH SHANDONG PROVINCE

摘要: 本文通过对两期二等三角网测量结果的计算,分析了沂沭裂谷附近-鲁中鲁南的应变状态,力学性质和最近二十年来地壳的水平运动.结果是:(1)该区水平应变场的平均参数为:主压应变轴是 N51E;最大剪应变的方向为 N6E 和 N84W;从而得出该区应变场的力学模型;(2)该区地壳水平形变的特征是:以灌云-临沂-曲阜为转换带的典型左旋图象.从而讨论了鲁中、南未来可能发震的危险部位.

Abstract: Computation of the results of two successive repeated second order triangulation survey, the strain and mechanical conditions and the horizontal crustal movement around the Yishu Eift Valley in Central and South Shandong have been analysed. Results of such a study show that (1) the average directions of the horizontal strain field are, N51E for the principal axis of compression, N 6 E and N 84W for the maximum shear strain, from which one can deduce the mechanical model of the crust of the region; (2) the horizontal crustal deformation of this region is charaterized by a typical left lateral pattern, taking the belt Guanyun-Linyi-Qufu as a transition.Based on such results, the portion for possible future earthquake occurrences of Central and South Shandong Province has been discussed.

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