郯庐断裂带及邻区深孔地应力测量与地震地质意义  

In situ stress measurement at deep boreholes along the Tanlu fault zone and its seismological and geological significance

作　　者：丰成君[1,2] 张鹏[1,2] 孟静[1,2] 戚帮申 秦向辉[1,2] 牛琳琳[1] 孙东生[1,2] 孙炜峰[1,2] 谭成轩[1,2] 陈群策[1,2] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]国土资源部新构造运动与地质灾害重点实验室,北京100081

出　　处：《地球物理学进展》2017年第3期946-967,共22页Progress in Geophysics

基　　金：中国地质调查局项目"京津冀协同发展区活动构造与区域地壳稳定性调查"(121201104000150012);中国地质科学院地质力学研究所基本科研业务费项目"京津冀地区地下空间地质环境调查预研究"联合资助

摘　　要：郯庐断裂带是中国东部大陆一条深大断裂带,也是规模最大的第四纪活动构造带和地震活动带,断裂带及邻区现代构造应力场明显控制了活动断裂的运动方式、活动强度和地震活动等,深入研究郯庐断裂带及邻区地壳浅层应力环境,对于探讨断裂带现今活动性无疑具有重要的科学意义.在总结前人研究成果的基础上,本文首先依据郯庐断裂带及邻区(山东-环渤海-辽宁)6个600~1000 m深孔地应力实测数据,初步揭示断裂带及邻区地壳浅层应力分布规律,并分析其在不同构造部位之间的差异;其次,结合研究区已有其他基础应力数据(震源机制解、钻孔崩落、应力解除及断层滑动矢量反演数据等),详细分析断裂带及邻区现今构造应力场及其对断裂活动方式的影响;最后依据库仑破裂摩擦准则,从力学角度分别探讨不同的应力状态和摩擦强度对郯庐断裂带山东、渤海及辽宁段现今活动稳定性的影响,同时参考断裂带及邻区近代地震活动分布特征,积极探索活动断裂带附近深孔地应力测量在地震地质研究领域中的应用思路.Tanlu fault belt is a deep fractured zone in eastern China,as well as the largest Quaternary active tectonic belt and seismic belt. Recent tectonic stress field obviously controls the motion mode of the fault,the acitivive intensity,and the seismicity of the fault belt. Therefore, there is an important scientific significance to make further research on the tectonic stress field near the Tanlu fault zone and the adjacent region. Based on the previous researching results, firstly, the paper preliminary reveals the distributing disciplinarian of the shallow crustal in situ stress,and analyzes the discrepancy of different tectonic positions,on the basis of the in sit stress measuring results at 6 boreholes with the dept between 600 m and 1000 m, near the ＂Shandong-Bohai SeaLiaoning＂ segment of the Tanlu fault zone and the vicinities.Secondly,the recent tectonic stress field in the vicinity of Tanlu fault belt is exhibited,combined with other basic stress data,such as focal mechanism solutions, boreholes breakouts, stress relief data,and fault slip vector inversion results. Furthermore, the influence of tectonic stress field on the fault active mode is also analyzed. Finally,the effect of stress state and frictional strength of the fault belt on the＂Shandong-Bohai Sea-Liaoning＂segment of the Tanlu fault activity is respectively dicussed,based on the Coulomb friction fracture criterion, from mechanics point of view.Meanwhile,we actively explore the application of in situ stress measurements at deep boreholes in the vicinity of active fault belt in studying the field of seismogeology,referring to the distribtution characteristics of the recent seismic activity along the Tanlu fault zone.

关 键 词：郯庐断裂带 地应力 水压致裂 现今构造应力场 地震地质 

分 类 号：P315[天文地球—地震学] P541[天文地球—固体地球物理学]