【摘要】 为查明辽东半岛金州地震活动断裂带现今地应力状态和活动状况,在该断裂带北段熊岳城东侧开展了随深度系统地取心钻探和水压致裂地应力测量工作,完成了600m钻探深度范围内地应力测量试验27段和水平最大主应力方向测试5段.钻探岩心初步揭示了地壳浅表层的岩体结构特征;随深度系统的地应力测量结果表明,3个主应力关系为SV>SH>Sh,垂直应力起主导作用,易于正断作用发生;现今最大水平主应力方向为56°~81°NE,反映NNE走向的金州断裂带北段现今活动具有右行走滑特征.地应力测量结果揭示的金州断裂带正断兼右行走滑特征与已有的该区域研究成果相吻合,为其现今活动性研究补充了新的动力学数据.更多还原

【Abstract】 Haicheng earthquake occurred in the north segment of Jinzhou fracture belt which is the most important active tectonic structure controlling earthquakes in Liaodong Peninsula.In this study,data was collected from 27in-situ stress and 5directional testing sensors installed at varying intervals along the total depth of single 600 mborehole located inside a granite rich region in the north segment of Jinzhou fracture belt at the east part of Xiongyue city.Combined with in-situ stress data of SV>SH>Sh,core sampling of the structural features of shallow earth crust rock formations reveals that the vertical principal stress plays a leading role in normal fault activity. Moreover,measured maximum in-situ principal stress trends towards the northeast-east direction and reflects present tensile properties,with dextral activity,of the Jinzhou segment.The results confirm the previous relevant studies,enriching the dynamics data and facilitating the understanding of the active features of the north segment of the Jinzhou fracture belt.更多还原