镇海—温州断裂分段性及新生代构造应力场研究

镇海—温州断裂带的新构造活动具分段性,即可分为明显活动的北段,具一定活动的中段及不活动的南段.新生代构造应力场至少可分为两期:第Ⅰ期时代为老第三纪,主压应力方向为NW-SE;第Ⅱ期时代为第三纪及第四纪,主压应力方向为NEE-SWW,现代应力场仍受此控制.新构造活动的分段性可与各分段构造应力场期次的恢复结果相对应.

A STUDY ON THE SEGMENTATION AND TECTONIC STRESS FIELD OF THE ZHENHAI-WENZHOU EXTENDING FAULTS IN CENOZOIC

The neotectonic activity in Zhenghai-Wenzhou fault zone appears altered from region to region, which can roughly be zoned into three parts: the explicitly active north part, the moderately active central part and the inactive south part. The tectonic stress field within Cenozoic was formed during at least two periods. The first one involves the whole Eogene, during which the direction of main stress was NW-SE; and the second is comprised of the Neocene and Quaternary with main stress taking the direction of NEE-SWW and remaining dominant up to the present. The segments of different neotectonic activity of the fault zone appears to be correspondent to the stages in which the stress field evolves after recovery.