| 海峡西岸长乐—南澳断裂带中段现今原位地应力测量 |
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| 关键词:Changle-Nan’ao fracture belt in-situ stress measurement hydraulic fracturing reverse fault |
| 基金项目:国土资源部公益性行业科研专项“我国东部沿海核电站区域地壳稳定性与地质灾害研究”(编号: 201211096); 中国地质调查局项目“首都圈地区关键构造部位深孔地应力测量监测与地质安全评价”(编号: 12120113012100) |
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| Present In-situ Stress Measurement in Middle Segment of Changle-Nan’ao Fracture Belt along the Western Coastal Region of Taiwan Strait and an Analysis of Its Activity |
| To explore the in-situ stress in the Changle-Nan’ao fracture belt and its present activity, the authors gathered data from 21 segments for in-situ stress measurement and from 4 segments for orientation of major principal stress varying intervals along the drill hole with total depth of 600 m located inside a granite-rich region in the northern part of Quanzhou City. Combined with the high in-situ stress data of SH>Sh>Sv, the core sampling of the structure features of shallow earth crust rock formation reveals that current horizontal principal stresses play a leading role in reverse fault activity. Moreover, measured maximum principal in-situ stress strikes in NWW direction and reflects present compressive properties, with dextral slip activity, of the middle segment. Calculated through measured principal stresses, the magnitudes of feature parameters μm and R reach 0.44~0.76 and 0.44~0.65 respectively, which reflect the high-stress accumulative capability of the regional crust and availability for the activity of fault movement in this area. The measured results indicate that the state of in-situ stress has reached the critical value, the activity of the fault is approaching the critical state, and the potential risk of the reverse fault has the tendency of sliding and shearing failure. With pre-existing research result, these new dynamic data will allow us to open new research avenues for understanding the present active features of the middle segment of the Changle-Nan’ao fracture belt and to provide a basic guarantee for the earthquake research and ur-ban safety. |
| ZHANG Peng,HU Qiu-yun,FENG Cheng-jun,SUN Wei-feng,TAN Cheng-xuan.2015.Present In-situ Stress Measurement in Middle Segment of Changle-Nan’ao Fracture Belt along the Western Coastal Region of Taiwan Strait and an Analysis of Its Activity[J].Acta Geoscientica Sinica,36(4):483-490. |
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