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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.
The Tanlu fault zone is a deep fault zone in the eastern Chinese mainland and also the largest Quaternary active structural belt and seismic activity belt. The modern tectonic stress field in the fault zone and its adjacent areas clearly controls the movement patterns, active intensity and Seismic activities and so on.It is of undoubtedly important scientific significance to explore the present-day activities of the fault zone in-depth study of the crustal stress environment in the Tan-Lu fault zone and its adjacent areas.Based on the previous research results, based on the Tan-Lu fault zone And the measured data of six 600-1000 m deep hole in the adjacent area (Shandong-Bohai Rim-Liaoning), revealing the shallow crustal stress distribution regularity in the fault zone and its adjacent area, and analyzing the differences among the different tectonic parts; Secondly, based on the other basic stress data (focal mechanism solutions, borehole caving, stress relief and fault slip vector inversion data) in the study area, the present tectonic stress field and its effect on fault activity Finally, according to Coulomb failure friction criterion, different stress states and frictional strengths were discussed respectively from the mechanical point of view. Affect the stability of the activity, while the reference distribution of seismic activity in modern fault zone and adjacent areas, and actively explore the application of ideas near active fault zone deep-situ stress measurements in the field of seismic geology.