天水地区地壳结构热分布与热应力特征初步研究

地壳内热活动及其产生的热应力作用是地震孕育发生的重要因素之一. 不同特征的地壳结构对热分布及其热应力有特殊的影响. 在含有莫霍面局部上隆、中下地壳的深大断裂、中地壳低速高导体和中上地壳断裂的典型孕震地壳结构模型中，深部热扰动作用下产生的热应力作用会明显上移至中上地壳，对上层脆性地壳的破裂——强地震的发生有直接影响. 这一结果对理解深部热流体在地震孕育和发生过程中的作用，以及浅层流体前兆的产生机理具有指导意义. 

PRILIMARY STUDY OF TEMPERATURE DISTRIBUTION AND ASSOCIATED THERMAL STRESS IN CRUST IN TIANSHUI, CHINA

The heat flow in curst and the thermal stress generated by the flow play a very important role in earthquake occurrence. Different crustal structure has different effect on heat distribution and associated thermal stress. In all of typical seismogenic crustal structure models, including the bulge of Moho surface, the deep-large fault in the mid-lower crust, low-velocity and high-conductive layer in the middle crust, and the typical crustal structure in mid-upper crust, the thermal stress produced by deep heat disturbance may moves up to the mid-upper crust. This leads to upper brittle part of crust break and hence, strong earthquakes. This result is constructional in enhancing our understanding of the role of deep heat flow in curst in development of earthquack and its generation, as well as the generation mechanism of the shallow flowing fluid.