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CAREER: Modification of a Continent: Seismic Tomography and Imaging of the Northern American Lithosphere

职业：大陆的改造：北美岩石圈的地震层析成像和成像

基本信息

批准号：
1942431
负责人：
Songqiao Wei
金额：
$ 56万
依托单位：
Michigan State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-05-15 至 2025-04-30
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1942431&HistoricalAwards=false
关键词：
CAREER Modification Continent Seismic Tomography

项目摘要

Changes in the continental lithosphere, the solid outer shell of the Earth, can greatly impact the surface environment of our planet, for example by controlling weather patterns and movement of water. Understanding how changes in the continents depend on processes at depth relies on detailed seismic images of the earth’s interior. With great seismic data coverage, North America is a perfect site for studying continental modification in diverse settings. Although it is one of the most extensively imaged continents, the details of the underlying processes of its evolution are still elusive, largely due to the discrepancies between existing seismic images. The goal of this project is to improve the seismic image resolution of the lithosphere of the North America from the surface to its root. The models will be developed using advanced seismic imaging techniques and complementary seismic data sets that can provide more complete information about the physical properties and features of the continental lithosphere. The results of this project will contribute to the understanding of how the North American continent is built, modified and destroyed. This project will tightly integrate research, education, and public outreach through an intensive “Spartan Shake” summer camp and research-based educational plan for under-represented undergraduate students and high-school science teachers. This project will also enhance the onsite science experience of the participants through analyzing, modeling, and visualizing the environmental seismic data collected by Raspberry Shake 3D seismometers deployed on the Michigan State University campus. This project aims at accurately imaging the lithosphere of North America by mapping 3D variations of both wave speeds and the internal interfaces, including sediment base, Moho, and the lithosphere and asthenosphere boundary. With the more robust seismological constraints of lithospheric structures, the following three key scientific goals can be achieved: (1) understand how the lateral gradients of lithospheric structure control the deformation of the plate margins through thinning, rifting, thickening, and foundering; (2) systematically investigate how asthenosphere interacts with lithosphere across different tectonic environments; (3) investigate the seismic signatures within sedimentary basins and the crust corresponding to underlying lithospheric and asthenospheric processes. Complementary seismic data sets, including ambient-noise-derived Empirical Green’s Functions, and regional and teleseismic data recorded by EarthScope Transportable Array, will be assimilated with different full waveform inversion techniques. This project will provide the first joint inversion of all these data sets under the full waveform inversion framework for more quantitative model comparison, assessment, and interpretation of continental evolution.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

大陆岩石圈（地球的固体外壳）的变化可以极大地影响我们星球的表面环境，例如通过控制天气模式和水的运动。要了解大陆的变化是如何依赖于地球内部的详细地震图像的。北美有大量的地震数据覆盖，是研究不同环境下大陆变化的理想地点。尽管它是最广泛成像的大陆之一，但其潜在演化过程的细节仍然难以捉摸，这主要是由于现有地震图像之间的差异。该项目的目标是提高北美岩石圈从地表到根部的地震图像分辨率。这些模型将使用先进的地震成像技术和互补的地震数据集来开发，这些数据集可以提供有关大陆岩石圈物理性质和特征的更完整的信息。这个项目的结果将有助于了解北美大陆是如何建造、改造和破坏的。该项目将通过密集的“斯巴达震动”夏令营和针对代表性不足的本科生和高中科学教师的研究型教育计划，将研究、教育和公众宣传紧密结合起来。该项目还将通过分析、建模和可视化部署在密歇根州立大学校园的树莓摇3D地震仪收集的环境地震数据，增强参与者的现场科学体验。该项目旨在通过绘制波速和内部界面（包括沉积物基底、莫霍、岩石圈和软流圈边界）的三维变化，对北美岩石圈进行精确成像。通过对岩石圈结构的地震约束，可以实现以下三个关键的科学目标：(1)了解岩石圈结构的横向梯度如何通过减薄、裂陷、增厚和沉降控制板块边缘的变形；(2)系统研究不同构造环境下软流圈与岩石圈的相互作用；(3)研究沉积盆地和地壳内与下伏岩石圈和软流圈作用相对应的地震特征。互补的地震数据集，包括环境噪声衍生的经验格林函数，以及由EarthScope可移动阵列记录的区域和远震数据，将被不同的全波形反演技术同化。该项目将首次在全波形反演框架下对所有这些数据集进行联合反演，以便对大陆演化进行更定量的模型比较、评估和解释。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Cartesian Meshing Spherical Earth (CMSE): A Code Package to Incorporate the Spherical Earth in SPECFEM3D Cartesian Simulations

笛卡尔网格划分球形地球 (CMSE)：将球形地球纳入 SPECFEM3D 笛卡尔模拟的代码包

DOI：
10.1785/0220210131
发表时间：
2022
期刊：
Seismological Research Letters
影响因子：
3.3
作者：
Li, Guoliang;Tao, Kai;Chen, Min;Li, Jiaqi;Maguire, Ross;Ma, Xiaodan
通讯作者：
Ma, Xiaodan

Resolving Continental Magma Reservoirs With 3D Surface Wave Tomography

利用 3D 表面波断层扫描解析大陆岩浆储层

DOI：
10.1029/2022gc010446
发表时间：
2022
期刊：
Geosystems
影响因子：
0
作者：
Maguire, Ross;Schmandt, Brandon;Chen, Min;Jiang, Chengxin;Li, Jiaqi;Wilgus, Justin
通讯作者：
Wilgus, Justin

Magma accumulation at depths of prior rhyolite storage beneath Yellowstone Caldera

DOI：
10.1126/science.ade0347
发表时间：
2022-12
期刊：
Science
影响因子：
56.9
作者：
R. Maguire;B. Schmandt;Jiaqi Li;Chengxin Jiang;Guoliang Li;J. Wilgus;Min Chen
通讯作者：
R. Maguire;B. Schmandt;Jiaqi Li;Chengxin Jiang;Guoliang Li;J. Wilgus;Min Chen

Sedimentary and Crustal Structure of the Western United States From Joint Inversion of Multiple Passive Seismic Datasets