A GPS Study of the Large-Scale Neotectonics of Northern Central America

中美洲北部大范围新构造运动的 GPS 研究

基本信息

  • 批准号:
    0309839
  • 负责人:
  • 金额:
    $ 16.18万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2003
  • 资助国家:
    美国
  • 起止时间:
    2003-06-01 至 2008-05-31
  • 项目状态:
    已结题

项目摘要

This project is a five-year collaborative geodetic study of the large-scale neotectonics of northern Central America, where the western end of the Caribbean plate abuts both the Middle America subduction zone and Motagua-Polochic strike-slip fault system. The scientific objectives are as follows: (1) Estimate the magnitude and distribution of frictional coupling along the Cocos-Caribbean subduction interface, (2) Measure the rate of strike-slip motion at one or more points across the Motagua-Polochic fault system, (3) Measure extension across the Central American "basin-and-range" south of the Motagua-Polochic fault system, (4) Measure how quickly strain accumulates across faults in the Central American volcanic arc that accommodate dextral forearc shear in response to oblique subduction, (5) Test whether significant regional uplift occurs, possibly in response to the hypothesized detachment of the slab subducting beneath this region, and (6) Improve kinematic models of the Caribbean plate geodetic reference frame. Work on the first objective is contributing to an emerging understanding of the fundamental role of aseismic processes in accommodating subduction. Progress on objectives 2-5 is advancing the present poor understanding of the neotectonics and seismic hazards at the western, trailing edge of the Caribbean plate. Work on the final objective benefits multiple NSF-sponsored GPS studies of deformation around the complexly deforming margins of the Caribbean plate. These objectives are being accomplished through modeling of velocities determined from annual or more frequent occupations of 50-100 GPS sites distributed throughout Honduras, Guatemala, and El Salvador and velocities at seven continuous GPS sites that are already operating in these countries. Modeling is done using three-dimensional finite element code that allows for a tectonically realistic representation of the study area, including laterally- and vertically-varying material properties representative of an ocean-continent subduction boundary. All measurements are made by local scientists, except for the initial network reconnaissance and installation, which were a collaborative effort.The project is structured to benefit significantly the research careers of Honduran, Guatemalan, and Salvadoran scientists with whom are collaborating. The budget includes annual operating funds, GPS receivers, and travel funds for Honduran seismologist and Guatemalan seismologists, and possibly an earth scientist from El Salvador. Ultimately, progress on the goals above will improve estimates of the likely frequency of significant earthquakes along a variety of faults that present a seismic hazard in this extensive region.
该项目是一项为期五年的中美洲北部大规模新构造合作大地测量学研究,加勒比板块西端与中美洲俯冲带和莫塔瓜-波洛奇走滑断层系统相邻。科学目标如下:(1)估计沿Cocos-Caribbean俯冲界面的摩擦耦合的大小和分布;(2)测量横跨motaagua - polochic断裂系统的一个或多个点的走滑运动速率;(3)测量横跨motaagua - polochic断裂系统南部的中美洲“盆地和山脉”的延伸;(4)测量应变在中美洲火山弧断层上积累的速度有多快,这些断层适应了斜向俯冲引起的右弧前切变;(5)测试是否发生了显著的区域隆起,可能是由于该地区俯冲下的板块的假设剥离;(6)改进加勒比板块大地测量参考框架的运动学模型。关于第一个目标的工作有助于对地震过程在适应俯冲方面的基本作用的新认识。目标2-5的进展正在推进目前对加勒比板块西部后缘新构造和地震危险的贫乏理解。在最终目标上的工作有利于美国国家科学基金会赞助的多个GPS研究,这些研究围绕着加勒比海板块复杂变形的边缘。这些目标正在通过对分布在洪都拉斯、危地马拉和萨尔瓦多的50-100个GPS站点的年度或更频繁的占领所确定的速度和已经在这些国家运行的7个连续GPS站点的速度进行建模来实现。建模使用三维有限元代码,允许研究区域的构造真实表示,包括代表海洋-大陆俯冲边界的横向和垂直变化的材料属性。所有的测量都是由当地科学家完成的,除了最初的网络侦察和安装,这是一个合作的努力。该项目旨在显著促进与之合作的洪都拉斯、危地马拉和萨尔瓦多科学家的研究事业。预算包括年度运营资金、GPS接收器、洪都拉斯地震学家和危地马拉地震学家的旅行资金,可能还包括一名来自萨尔瓦多的地球科学家。最终,上述目标的进展将改善对这一广阔地区存在地震危险的各种断层沿线重大地震可能发生频率的估计。

项目成果

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Dennis DeMets其他文献

Dennis DeMets的其他文献

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{{ truncateString('Dennis DeMets', 18)}}的其他基金

RAPID GPS data acquisition in Jamaica for coseismic and postseismic studies of the Jan. 28, 2020 M=7.7 Oriente Fault earthquake
牙买加 RAPID GPS 数据采集,用于 2020 年 1 月 28 日 7.7 级东方断层地震的同震和震后研究
  • 批准号:
    2022468
  • 财政年份:
    2020
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Standard Grant
Toward an understanding of Neogene plate dynamics: Completion of a high-resolution, closure-enforced chronology of global plate motions since 20 Ma
了解新近纪板块动力学:完成 20 Ma 以来全球板块运动的高分辨率、封闭强制年表
  • 批准号:
    1433323
  • 财政年份:
    2014
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Standard Grant
Collaborative Research: Integrated Studies of Continental Triple Junction Tectonics, Northern Central America
合作研究:中美洲北部大陆三重交界构造的综合研究
  • 批准号:
    1144418
  • 财政年份:
    2012
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Continuing Grant
GPS measurements and earthquake cycle modeling of the Mexico subduction zone
墨西哥俯冲带的 GPS 测量和地震周期建模
  • 批准号:
    1114174
  • 财政年份:
    2011
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Continuing Grant
Closing the global plate circuit: High resolution reconstructions of African plate motion from 0 to 20 Ma
闭合全球板块回路:0 至 20 Ma 非洲板块运动的高分辨率重建
  • 批准号:
    0926274
  • 财政年份:
    2009
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Standard Grant
Collaborative Research: An Integrated Tectonic Study of the Jamaica Strike-slip Restraining Bend and Gonave Microplate Using GPS, Geomorphologic, Seismic, and Gravity Data
合作研究:利用 GPS、地貌、地震和重力数据对牙买加走滑约束弯道和戈纳夫微板块进行综合构造研究
  • 批准号:
    0609578
  • 财政年份:
    2007
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Continuing Grant
Collaborative Research: An Integrated GPS and Structural Study of the Cocos-Caribbean Boundary in Nicaragua and El Salvador
合作研究:尼加拉瓜和萨尔瓦多科科斯-加勒比边界的综合 GPS 和结构研究
  • 批准号:
    0538131
  • 财政年份:
    2006
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Continuing Grant
Collaborative Research: Continuation of a GPS Study of the Subduction Earthquake Cycle: Jalisco, Mexico
合作研究:俯冲地震周期 GPS 研究的继续:墨西哥哈利斯科州
  • 批准号:
    0510553
  • 财政年份:
    2005
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Continuing Grant
Collaborative research: Completion of the MORVEL global plate motion models
合作研究:完成MORVEL全球板块运动模型
  • 批准号:
    0453113
  • 财政年份:
    2005
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Standard Grant
Collaborative research: A study of transient aseismic slip and non-volcanic tremor in southern Mexico with large aperture seismic and GPS arrays
合作研究:利用大孔径地震和GPS阵列研究墨西哥南部瞬态地震滑移和非火山地震
  • 批准号:
    0510887
  • 财政年份:
    2005
  • 资助金额:
    $ 16.18万
  • 项目类别:
    Continuing Grant

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