Collaborative Research: Multi-scale models of subduction zone earthquake cycle observations

合作研究:俯冲带地震周期观测的多尺度模型

基本信息

  • 批准号:
    1722650
  • 负责人:
  • 金额:
    $ 12.41万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2017
  • 资助国家:
    美国
  • 起止时间:
    2017-07-01 至 2020-08-31
  • 项目状态:
    已结题

项目摘要

Earth's tectonic plates get recycled back into the mantle at subduction zones. The largest earthquakes happen there, and these megathrust environments also generate a range of other geohazards including tsunamis and volcanoes, making their study of great societal relevance. Recently, seismological and geodetic measurements have revealed a range of phenomena associated with megathrust behavior that are not captured by a simple, stick-slip earthquake cycle model of slow loading and catastrophic rupture. These newly discovered phenomena include transient, creeping events of fault slip on decadal scales which may indicate preparatory behavior of the fault system, perhaps systematically linked to the main seismic event. Mechanical models have not quite kept up with these new discoveries and our understanding of the physical processes behind these phenomena is incomplete. A new, integrative framework is therefore needed to understand the physical mechanisms and fault constitutive laws behind complex deformation and seismicity patterns. This project seeks to develop such a mechanical model, initially for the data rich Japan setting, in order to understand regional megathrust dynamics and fault interaction patterns, as well as improve seismic hazard estimates. Later, such a mechanical model may potentially be deployed at other subduction zones such as Cascadia and assist in interpreting existing and planned monitoring data streams for earthquake forecasting and early warning. To capture the spatial and temporal scales involved in this complex problem, three sub-projects are to be pursued in collaboration between researchers at University of Texas Austin (UTIG), Purdue University, and the University of Tokyo: 1) The development of sets of multi earthquake-cycle scenarios based on numerical models of visco-elastic, inter-, pre-, co- and post-seismic fault loading in Japan. 2) The development of global mantle flow and regional, time-evolving mantle convection models to understand long-term, subduction induced forcing of plate boundaries and backarcs in the region. 3) The development of cross-timescale, visco-elasto-plastic models in 3-D, incorporating rate and state friction as well as other fault constitutive laws in a dynamically consistent, thermo-mechanical convection framework. This will enable, for example, studying the role of pre-seismic, slow slip phenomena for fault zone evolution, eventually in the presence of fluid flow. All project parts will be integrated, and results from different approaches cross-checked. Moreover, all sub-projects are complementary and will guide the establishment of the general subduction zone model that is needed to understand earthquake cycle observations and seismicity in Japan and elsewhere.
地球的构造板块在俯冲带被回收到地幔中。最大的地震发生在那里,这些巨型逆冲环境也产生了一系列其他地质灾害,包括海啸和火山,使他们的研究具有重大的社会意义。最近,地震学和大地测量测量揭示了一系列与巨型逆冲行为相关的现象,这些现象不能被简单的慢加载和灾难性破裂的粘滑地震周期模型所捕捉。这些新发现的现象包括在年代际尺度上断层滑动的瞬变蠕动事件,这些事件可能表明断层系统的预备行为,可能与主要地震事件有系统的联系。机械模型并没有完全跟上这些新发现,我们对这些现象背后的物理过程的理解是不完整的。因此,需要一个新的、综合的框架来理解复杂变形和地震活动模式背后的物理机制和断层本构规律。该项目旨在开发这样一个力学模型,最初用于数据丰富的日本环境,以了解区域大逆冲动力学和断层相互作用模式,并改进地震危险性估计。之后,这样的力学模型可能会被部署到其他俯冲带,如卡斯卡迪亚,并协助解释现有的和计划中的监测数据流,以进行地震预报和早期预警。为了捕捉这个复杂问题所涉及的空间和时间尺度,德克萨斯大学奥斯汀分校(UTIG)、普渡大学和东京大学的研究人员将合作开展三个子项目:(1)基于日本黏弹性、地震间、地震前、地震共、地震后断层加载数值模型的多地震旋回情景集的发展。(2)全球地幔流和区域、时间演化的地幔对流模型的发展,以了解该地区板块边界和后弧的长期俯冲诱导强迫。3)建立跨时间尺度的三维粘弹塑性模型,将速率和状态摩擦以及其他断层本构规律纳入动态一致的热-机械对流框架中。例如,这将使研究地震前、慢滑现象对断裂带演化的作用,最终在流体流动存在的情况下。所有的项目部分将被整合,并从不同的方法交叉检查结果。此外,所有子项目都是互补的,并将指导建立一般俯冲带模型,这是了解日本和其他地方地震周期观测和地震活动性所需要的。

项目成果

期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Stress change before and after the 2011 M9 Tohoku-oki earthquake
  • DOI:
    10.1016/j.epsl.2018.09.035
  • 发表时间:
    2018-12-15
  • 期刊:
  • 影响因子:
    5.3
  • 作者:
    Becker, Thorsten W.;Hashima, Akinori;Sato, Hiroshi
  • 通讯作者:
    Sato, Hiroshi
Simulation of slip transients and earthquakes in finite thickness shear zones with a plastic formulation.
  • DOI:
    10.1038/s41467-018-06390-z
  • 发表时间:
    2018-09-25
  • 期刊:
  • 影响因子:
    16.6
  • 作者:
    Tong X;Lavier LL
  • 通讯作者:
    Lavier LL
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Andrew Freed其他文献

Andrew Freed的其他文献

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{{ truncateString('Andrew Freed', 18)}}的其他基金

Collaborative Research: Reorganization of stresses beneath greater Tokyo after the 2011 Tohoku-Oki M9 earthquake
合作研究:2011 年东北冲 M9 级地震后大东京地区地下应力的重组
  • 批准号:
    1215358
  • 财政年份:
    2012
  • 资助金额:
    $ 12.41万
  • 项目类别:
    Standard Grant
Identification of Postseismic Transients in PBO GPS Time-Series
PBO GPS 时间序列中震后瞬变的识别
  • 批准号:
    0952234
  • 财政年份:
    2010
  • 资助金额:
    $ 12.41万
  • 项目类别:
    Standard Grant
Contemporary Strain and Stressing Rates in Central and Southern Alaska Through the Earthquake Cycle
阿拉斯加中部和南部地震周期中的当代应变和应力率
  • 批准号:
    0710937
  • 财政年份:
    2007
  • 资助金额:
    $ 12.41万
  • 项目类别:
    Standard Grant
Collaborative Research: Modeling of 3-D Viscoelastic Stress Transfer in the California Crust: Implications for Earthquake Triggering and Seismic Hazard Migration
合作研究:加州地壳 3D 粘弹性应力传递建模:对地震触发和地震灾害迁移的影响
  • 批准号:
    0342914
  • 财政年份:
    2003
  • 资助金额:
    $ 12.41万
  • 项目类别:
    Standard Grant
Collaborative Research: Modeling of 3-D Viscoelastic Stress Transfer in the California Crust: Implications for Earthquake Triggering and Seismic Hazard Migration
合作研究:加州地壳 3D 粘弹性应力传递建模:对地震触发和地震灾害迁移的影响
  • 批准号:
    0122868
  • 财政年份:
    2001
  • 资助金额:
    $ 12.41万
  • 项目类别:
    Standard Grant
Earth Sciences Postdoctoral Research Fellowship Award
地球科学博士后研究奖学金
  • 批准号:
    9704677
  • 财政年份:
    1997
  • 资助金额:
    $ 12.41万
  • 项目类别:
    Fellowship Award

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