摘要
利用跨断层水准测量资料，结合长水准测量成果，重点分析了沂沭断裂带及其附近地区垂直形变特征及本区中强地震前异常形态。结果表明：沂沭带附近的地壳形变明显受新构造活动的控制，断层的最大垂直运动速率为０５０ｍｍ／ａ，沂沭带断层垂直运动平均速率合成值约为０３４ｍｍ／ａ，现今总体活动水平较低；沂沭带北段及北西向断裂近期呈反向运动，南段呈继承性构造运动，部分测点在本区中等及中强地震前异常较典型，主要异常形态为“Ｕ”或“Ｎ”型。
おhe vertical deformation characteristics and anomalous morphology prior to moderate earthquake of the Yishu fault zone and adjacent area are analysed using cross fault leveling data and long spaced leveling results. It is shown that the ground deformation near Yishu fault zone is mainly controled by neotectonic movement, the maximum rate of the fault vertical movement is 0.50mm/a, the synthetic value of its average rate is 0.34mm/a, which reflects the recent action of the fault zone is generally weak, and the movements of its north segment and NW fracture have the proper of opposite direction, and the tectonic movement of its south segment has a inheritance character, and the main anomalous morphologies prior to moderate earthquake of partial stations are U or N shape which is typical.
出处
《地震学刊》
CSCD
1998年第2期10-17,共8页
Journal of Seismology
关键词
沂沭断裂带
垂直形变
异常分析
断层
: Yishu fault zone vertical deformation anomalous analysis
