Global S&T Development Trend Analysis Platform of Resources and Environment
项目编号 | 1919650 |
Full waveform modeling and inversion of seismic attenuation and application to characterizing near-surface fractures at Susquehanna Shale Hills Critical Zone Observatory | |
Tieyuan Zhu (Principal Investigator) | |
主持机构 | Pennsylvania State Univ University Park |
项目开始年 | 2019 |
2019-12-01 | |
项目结束日期 | 2020-11-30 |
资助机构 | US-NSF |
项目类别 | Standard Grant |
项目经费 | 125000(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | Seismologists often use seismic waves to study the Earth's interior. This is because seismic wave properties are very sensitive to the physical and chemical state of the Earth, from the shallow to the deep Earth. This project explores one such property, seismic attenuation, which is considered to be a direct indicator for temperature of the Earth with depth, as well as the presence of fluids. Because of its multi-purpose use, a map of this property in Earth structure can improve our understanding of how the Earth's interior works. The main goal of this project is to develop a method to image seismic attenuation using seismic waves. Broader impacts include the mentoring of a postdoctoral researcher at Penn State University and the development of new methods for the scientific community to use. Measurements of seismic wave attenuation potentially provide valuable source of information about the physical and chemical state of the Earth's interior. Seismic full waveform inversion (FWI) as a promising measurement tool for inverting Q still has several key issues to be investigated: 1) whether or not the existing fractional anelastic wave equation, that separates amplitude absorption and phase dispersion, can facilitate the development of FWI; 2) explicit Q embedded in fractional anelastic wave equations will simplify the computations of gradient; 3) how cross-talks between velocity and Q in FWI could be alleviated. To address these issues, this project will conduct three main tasks. First, starting from the newly developed fractional anelastic wave equation that parameterize an explicit Q, a Q-FWI method will be developed using adjoint-state approaches. Second, a suitable inversion strategy for multi-parameters (velocity and Q) will be sought. Third, the Q-FWI will be validated using synthetic near-surface geological models. 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. |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/213800 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Tieyuan Zhu .Full waveform modeling and inversion of seismic attenuation and application to characterizing near-surface fractures at Susquehanna Shale Hills Critical Zone Observatory.2019. |
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