...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geodynamics >Subduction thermal structure, metamorphism and seismicity beneath north- central Chile
【24h】

Subduction thermal structure, metamorphism and seismicity beneath north- central Chile

机译：智利北部的俯冲热结构，变质和地震性

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

Massive M 8 earthquakes have repeatedly struck the coastal Chilean subduction megathrust at intervals of nearly ten years, and such tsunamigenic earthquakes have caused recurrent damage. A widely accepted mature seismic gap along the strongly coupled plate interface in northern Chile was filled unexpectedly by the occurrence of the 2014 M-w 8.2 Iquique earthquake, which occurred 130 years after the previous quake. This event revealed that our understanding of the state of seismogenesis along the Chilean margin is still poor. This study aims at investigating the temperature and water content distributions within the Nazca slab along a large portion of the Chilean margin. We employ 3-D time-dependent thermomechanical numerical models that incorporate up-to-date slab geometry and phase diagrams of hydrous minerals in the subducting plate to study the north central Chilean (19 degrees S-33 degrees S) coupled megathrust, including the region where the slab is subhorizontal (28 degrees S-32 degrees S). Our modeling results show that most shallow off- and onshore interplate earthquakes in north central Chile in the last decade have been mainly controlled by the phase transformation from lawsonite blueschist to amphibolite at shallow depths. On the other hand, some of the deep subduction seismicity is in good agreement with eclogitization within the oceanic crust and formation of harzburgite in the ultramafic rock in the lower slab. The M 6 interplate earthquakes are estimated to occur where our models predict slab temperatures less than 400-600 degrees C and slab dehydration less than 0.03-0.05 wt%/km. Slow slip events tend to occur in regions where interplate temperatures are 400-600 degrees C (0.03-0.05 wt%/km). The activity level of regional interplate earthquakes and slow slip events is interpreted to be affected by the fluid release from and the temperature distribution in the Nazca slab.
机译：大规模的M> 8地震已经多次击中了近十年的间隔沿海智利俯冲Megathrust，而这种海啸地震导致反复造成的伤害。通过2014 M-W 8.2 IQuique地震的发生，沿智利北部强耦合板界面的广泛接受的成熟地震隙沿着智利北部的强烈耦合的板界面。这次活动表明，我们对智利边缘沿着智利利润的地震发生状态的理解仍然很差。本研究旨在调查沿着大部分智利边缘的纳斯卡板内的温度和水含量分布。我们采用了三维时间依赖的热机械数值模型，该数值模型包含了底板板中的熟水矿物质的最新板坯几何形状和相图，以研究北部中央智利（19摄氏度S-33摄氏度）耦合巨大，包括板坯是脱色的区域（28度S-32°S）。我们的建模结果表明，过去十年中，智利北部大部分浅层和陆上陆上地震的地震主要受到德森特蓝布尔什党人在浅层深度的阶段转型来控制。另一方面，一些深俯冲地震性与海底地壳内的eNlogitization吻合良好，并在下板中的超微岩石中形成了哈尔茨堡特。估计M> 6个Interpate地震发生在我们的模型预测小于400-600℃和平板脱水的平板温度小于0.03-0.05wt％/ km。慢滑事件倾向于发生在Inter平板温度为400-600摄氏度的区域（0.03-0.05％/ km）。区域Interpate地震和缓冲事件的活动水平被解释为受液体释放的影响和NaZCA板中的温度分布的影响。

著录项

  • 来源
    《Journal of geodynamics》 |2019年第9期|299-312|共14页
  • 作者

    Ji Yingfeng; Yoshioka Shoichi; Constantin Manea Vlad; Manea Marina; Suenaga Nobuaki;

  • 作者单位

    Kobe Univ Res Ctr Urban Safety & Secur Rokkodai Cho 1-1 Nada Ward Kobe Hyogo 6578501 Japan|Chinese Acad Sci Inst Tibetan Plateau Res Beijing 100101 Peoples R China;

    Kobe Univ Res Ctr Urban Safety & Secur Rokkodai Cho 1-1 Nada Ward Kobe Hyogo 6578501 Japan|Kobe Univ Grad Sch Sci Dept Planetol Rokkodai Cho 1-1 Nada Ward Kobe Hyogo 6578501 Japan;

    Univ Nacl Autonoma Mexico Ctr Geociencias Computat Geodynam Lab Campus Juriquilla Queretaro 76230 Qro Mexico|Romanian Acad Astron Inst Bucharest 040557 Romania;

    Univ Nacl Autonoma Mexico Ctr Geociencias Computat Geodynam Lab Campus Juriquilla Queretaro 76230 Qro Mexico|Romanian Acad Astron Inst Bucharest 040557 Romania;

    Kobe Univ Res Ctr Urban Safety & Secur Rokkodai Cho 1-1 Nada Ward Kobe Hyogo 6578501 Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Chilean subduction zone; Thermal regime; Slab dehydration; 3-D numerical model;

    机译：智利俯冲区;热制度;板坯脱水;3-D数模型;

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