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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >In situ stress conditions at IODP Site C0002 reflecting the tectonic evolution of the sedimentary system near the seaward edge of the Kumano basin, offshore from SW Japan
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In situ stress conditions at IODP Site C0002 reflecting the tectonic evolution of the sedimentary system near the seaward edge of the Kumano basin, offshore from SW Japan

机译：在IODP网站C0002的原位应力条件反映了来自SW日照的海上河岸盆地海滨边缘附近沉积系统的构造演变

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摘要

This paper presents a complete set of in situ stress calculations for depths of 200-1400 meters below seafloor at Integrated Ocean Drilling Program (IODP) Site C0002, near the seaward margin of the Kumano fore-arc basin, offshore from southwest Japan. The vertical stress component was obtained by integrating bulk density calculations from moisture and density logging data, and the two horizontal components were stochastically optimized by minimizing misfits between a probabilistic model and measured breakout widths for every 30m vertical segment of the wellbore. Our stochastic optimization process reveals that the in situ stress regime is decoupled across an unconformity between an accretionary complex and the overlying Kumano fore-arc basin. The stress condition above the unconformity is close to the critical condition for normal faulting, while below the unconformity the geologic system is stable in a normal to strike-slip fault stress regime. The critical state of stress demonstrates that the tectonic evolution of the sedimentary system has been achieved mainly by the regionally continuous action of a major out-of-sequence thrust fault during sedimentation in the fore-arc basin. The stable stress condition in the accretionary prism is interpreted to have resulted from mechanical decoupling by the accommodation of large displacement along the megasplay fault.
机译：本文介绍了一套完整的原位应力计算，深度为200-1400米以下的海底钻井计划（IODP）网站C0002，靠近日本西南部海上牛野前弧盆地的海滨裕度。通过从湿度和密度测井数据积分堆积密度计算来获得垂直应力分量，通过最小化概率模型与井筒的每个30m垂直段测量的突出宽度，随着两个水平分量而通过测量的突破宽度来大放异地优化。我们的随机优化过程揭示了原位应力制度在累积复合体和覆盖的熊甘岛前弧盆地之间的不整合上分离。高于无关的应力条件接近正常断层的临界条件，而在不合格的情况下，地质系统在正常到击球故障应力制度中稳定。临界压力状况表明，沉积体系的构造演进主要是通过在前弧盆地沉降期间的主要序列推动故障的区域连续作用来实现的。稳定的棱镜中的稳定应力条件被解释为通过沿着Megasplay故障的大置换的容纳来源的机械解耦。

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