...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geochemistry, geophysics, geosystems >Strain decoupling reveals variable seismogenic risk in SE Japan (Nankai Trough)
【24h】

Strain decoupling reveals variable seismogenic risk in SE Japan (Nankai Trough)

机译：应变解耦揭示了日本东南部（南海海槽）的可变致震风险

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The determination of in situ stress states is vital in understanding the behavior of faults and subsequent seismogenesis of accretionary prisms. In this paper, a high-quality 3-D seismic volume is used to map the depth of the extensional-compressional decoupling (ECD) boundary in the accretionary prism of Nankai, with the prior knowledge that strike-slip and compressional stresses occur deeper than 1250 m below seafloor (mbsf) in the Kumano Basin, changing to extension toward the seafloor. A total of 1108 faults from the accretionary prism are analyzed to estimate paleostresses via fault inversion and slip tendency techniques. A key result in this paper is that the ECD boundary can be used as a proxy to identify active structures on accretionary prisms as its depth depends on (a) local tectonic uplift in areas adjacent to active faults and (b) the thickness of sediment accumulated above active thrust anticlines. The depth of the ECD boundary ranges from 0 to approximate to 650 mbsf, being notably shallower than in the Kumano Basin. In Nankai, frontal regions of the imbricate-thrust zone, and the megasplay fault zone, reveal the shallower ECD depths and correlate with the regions where faulting is most active. As a corollary, this work confirms that estimates of stress state variability based on the analysis of 3-D seismic data are vital to understand the behavior of faults and potential seismogenic regions on convergent margins.
机译：确定原地应力状态对于了解断层的行为和随后增生棱镜的地震成因至关重要。在本文中，使用高质量的3D地震体来绘制南开增生棱镜中的拉伸-压缩解耦（ECD）边界的深度，并且先验知识是走滑和压缩应力比熊野盆地海底（mbsf）以下1250 m，向海底延伸。通过断层反演和滑移趋势技术分析了来自增生棱镜的总共1108个断层，以估计古应力。本文的主要结果是，ECD边界可以用作识别增生棱柱上的活动结构的代理，因为其深度取决于（a）活动断层附近区域的局部构造隆升和（b）堆积的沉积物厚度在主动推力背斜上方。 ECD边界的深度范围从0到大约650 mbsf，明显小于Kumano盆地。在南开，盘根冲断带的前缘区域和兆张断裂带，揭示了较浅的ECD深度，并与断裂最活跃的区域相关。作为推论，这项工作证实了基于3-D地震数据分析的应力状态变异性估计对于理解会聚边界上的断层和潜在的成地震区的行为至关重要。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号