天津近海应力集中区与地震—火山活动的空间分布关系

天津近海地区受中—新生代以来多期构造运动叠加的影响,现今区域应力场最大压应力主轴方向为NEE—SWW向,同时区内NE向和近EW向活动断裂众多,新生代地震、火山活动强烈。从应力场和断裂相互影响的角度出发,综合应力集中的分布模式和大量文献资料,划分天津近海地区断裂附近的应力集中区;对比区域内地震活动和火山岩的空间分布特点,探讨天津滨海、近海地区应力集中区与地震、火山活动之间的关系。

THE SPATIAL RELATIONSHIP BETWEEN THE STRESS CONCENTRATED ZONE AND EARTHQUAKE-VOLCANIC ACTIVITIES IN TIANJIN OFFSHORE AREA

Owing to the effect of Meso-Cenozoic tectonic movements, the maximum compressive stress of the regional stress field is in a direction of NEE-SWW in Tianjin offshore area, and the NE and EW active faults are well developed. Strong earthquakes and volcanic activities occasionally happened in the Cenozoic Era. Large amount of literatures suggests that the distribution of stress concentration zone can be inferred from stress-fault interaction. Efforts are made in this paper to reveal the spatial relationship between the stress concentration zone and the distribution of earthquake-volcanic activities in Tianjin offshore area.