天水地区深部构造走向及区域应力场  

STRIKE OF DEEP STRUCTURE AND REGIONAL STRESS FIELD IN TIANSHUI AREA

作　　者：林长佑[1] 武王霞 杨长福[1] 陈军营[1] 

机构地区：[1]国家地震局兰州地震研究所

出　　处：《地震研究》1996年第2期175-183,共9页Journal of Seismological Research

摘　　要：利用大地电磁阻抗和倾于函数确定天水地区深部构造主体呈北北东或近南北走向。在１６５４年天水南８级地震Ｘ区度等震线及一个邻近区域内，由ＭＴＳ资料所确定的深部构造走向基本上与等震线长轴方向相一致，而由高频ＭＴＳ资料所确定的浅部构造走向则显示了较为复杂的特征。这一地区震源机制解主压应力的方位角集中于北东６３°—８７°之间，大体与该处布格重力异常等值线相垂直。It has been determined by telluric electromagnetic impedance and tipper function that deep structure in Tianshui area mainly strikes in NNE or nearly SN. In the area of isoseisms of Ⅹ, an earthquake of M=8 occurred in 1654,and its ajacent places, the strike of deep structure is basically coincident with the direction of isoseisms in long axis by MTS data,however,the strikes of shallow structures determined by MTS of high frequncy show more complicated features. The azimuths of major compressional stress in this area are concentrated from 63°to 87°according to source mechanism solutions, which is roughly perpendicular with isogams of Bouguer anomaly

关 键 词：大地电磁测探 沉部构造 应力场 甘肃 天水地区 

分 类 号：P542.5[天文地球—构造地质学] P554[天文地球—地质学]