晋陕豫交界地壳应力场特征分析  

Characteristics of the crustal stress field in the juncture of Shanxi,Shaanxi,and Henan Provinces

作　　者：闫睿 万永革[2,3] 崔华伟 王明亮[1] 高家乙 付靖 YAN Rui;WAN Yongge;CUI Huawei;WANG Mingliang;GAO Jiayi;FU Jing(Henan Earthquake Agency,Zhengzhou 450000,Henan,China;Institute of Disaster Prevention,Sanhe 065201,Hebei,China;Hebei Key Laboratory of Earthquake Dynamics,Sanhe 065201,Hebei,China;Shandong Earthquake Agency,Ji'nan 250000,Shandong,China;Henan Health Cadre Institute,Zhengzhou 450008,Henan,China)

机构地区：[1]河南省地震局,河南郑州450000 [2]防灾科技学院,河北三河065201 [3]河北省地震动力学重点实验室,河北三河065201 [4]山东省地震局,山东济南250000 [5]河南卫生健康干部学院,河南郑州450008

出　　处：《地震工程学报》2022年第4期953-961,共9页China Earthquake Engineering Journal

基　　金：中国地震局监测、预报、科研三结合课题(3JH-202002018);中国地震局地震科技星火计划项目(XH20036)。

摘　　要：收集2008—2018年3036个地震的20395个P波初动资料,应用综合震源机制解法对晋陕豫交界应力场进行反演计算,得到研究区浅部0.15°×0.15°的精细应力场分布状态。结果显示:(1)晋陕豫交界大部分地区主要受走滑和拉张应力体系的作用,整体压应力轴方位表现为NE-NEE向,张应力轴方位表现为近NS向,表明山西断陷盆地为典型走滑拉张的产物;(2)华山山前断裂周边及洛阳盆地出现挤压型应力场作用的特征,反映出逆冲作用机制在这两个地区占主要成分;(3)夹于封门口—五指岭断裂带和新安—郏县断裂带的地区出现了P波矛盾比最大值,表明应力场在该区域的复杂性,该地区受拉张和走滑双重作用控制;(4)晋陕豫交界应力场存在明显的非均匀性特征,隆起和坳陷的过渡区往往是应力场非均匀性特征的主要体现。Based on 20395 items of P-wave initial motion data of 3036 earthquakes from 2008 to 2018,the stress field at the junction of Shanxi,Shaanxi,and Henan Provinces was inverted and calculated by using the composite focal mechanism method,and the distribution of fine stress field in the shallow part of the study area(0.15°×0.15°)was obtained.The results showed that:(1)Most areas at the junction of Shanxi,Shaanxi,and Henan Provinces are mainly under the strike-slip and extensional stress regime.The orientation of the principal compressive stress axis is NE-NEE,and the orientation of the extensio n stress axis is nearly NS,indicating that the Shanxi rift basin is a product of typical strike slip and extension;(2)The characteristics of compressive stress field around Huashan piedmont fault and Luoyang basin reflect that the thrust mechanism is the main component in these two areas;(3)The maximum P-wave contradiction ratio appears in the area between Fengmenkou-Wuzhiling fault zone and Xin'an-Jiaxian fault zone,indicating that this area with complex stress field is controlled by the dual effect of extension and strike slip;(4)There are obvious heterogeneity characteristics in the stress field at the junction of Shanxi,Shaanxi and Henan,which is mainly reflected in the transition area between uplift and depression.

关 键 词：晋陕豫交界 应力场 综合震源机制解 非均匀性特征 

分 类 号：P315.2[天文地球—地震学]