Understanding and Performing High-Resolution Surface-Wave Attenuation Measurements with USArray
了解并使用 USArray 进行高分辨率表面波衰减测量
基本信息
- 批准号:1252191
- 负责人:
- 金额:$ 28.12万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2013
- 资助国家:美国
- 起止时间:2013-04-01 至 2017-03-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
"Understanding and Performing High-Resolution Surface-Wave Attenuation Measurements with USArray"This project focuses on making use of seismic wave amplitudes to achieve high-resolution images of the Earth's crust and upper mantle. Velocity imaging using the travel times of surface waves has been extremely successful, but interpretations of these velocity images are non-unique. The amplitude analysis performed here constrains not only velocity structure, but also density and attenuation structure. This extra knowledge helps solve the non-uniqueness problem, allowing better constraints on key features of the North American continent's deformation history, evolution, and geochemical and tectonic structure. In particular, the high-resolution attenuation measurements are potentially sensitive to features such as magma and partial melt, water and other volatiles, as well as fault structures through the differing dependencies of these features on intrinsic attenuation as compared with seismic velocities.This work provides higher resolution images compared to previous attenuation and density imaging due to the confluence of vastly improved station coverage by USArray with new data processing techniques. On one hand, developments in theoretical and empirical techniques allow for utilization of ambient noise attenuation tomography, even when the noise sources are non-uniformly distributed. These ambient noise methods promise to allow for improved spatial resolution compared to earthquake-based studies due partly to the increased frequency band over which measurements are successful. On the other hand, developments in array-based phase-front tracking and amplitude mapping make it possible to use the dense station coverage of USArray to account for focusing and defocusing effects and to reduce the influence of source uncertainty. The convergence of this theoretical, numerical and empirical work allows for accurate measurements of surface-wave amplitudes, both for ambient noise and earthquakes, and allows for the density and attenuation imaging considered here.
“利用USAray了解和进行高分辨率面波衰减测量“本项目的重点是利用地震波振幅获得地壳和上地幔的高分辨率图像。 利用面波的走时进行速度成像是非常成功的,但是对这些速度图像的解释是不唯一的。 振幅分析不仅能反映速度结构,而且能反映密度和衰减结构。 这些额外的知识有助于解决非唯一性问题,从而更好地限制北美大陆变形历史、演化以及地球化学和构造结构的关键特征。 特别是,高分辨率衰减测量可能对岩浆和部分熔融、水和其他挥发物等特征敏感,以及断层结构,通过这些特征与地震速度相比对固有衰减的不同依赖性。与以前的衰减和密度成像相比,这项工作提供了更高分辨率的图像,这是由于USAray大大改善了台站覆盖范围,新的数据处理技术。 一方面,理论和经验技术的发展允许利用环境噪声衰减层析成像,即使当噪声源是非均匀分布的。 与基于地震的研究相比,这些环境噪声方法有望提高空间分辨率,部分原因是测量成功的频带增加。 另一方面,基于阵列的相位波前跟踪和振幅映射的发展使得可以使用USArray的密集站点覆盖来解释聚焦和散焦效应,并减少源不确定性的影响。 这种理论,数值和经验工作的收敛允许精确测量面波振幅,无论是环境噪声和地震,并允许这里考虑的密度和衰减成像。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Victor Tsai其他文献
Victor Tsai的其他文献
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{{ truncateString('Victor Tsai', 18)}}的其他基金
A physics-based neural network approach for geophysical inversions
用于地球物理反演的基于物理的神经网络方法
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2011079 - 财政年份:2020
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$ 28.12万 - 项目类别:
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1316348 - 财政年份:2013
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$ 28.12万 - 项目类别:
Continuing Grant
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