High resolution seismic refraction imaging of plate boundary structures by full waveform inversion off western Kii Peninsula, Nankai Trough

纪伊半岛西部、南海海槽全波形反演板块边界结构高分辨率地震折射成像

• 批准号: 22K20392
• 负责人: Qin Yanfang
• 金额: $ 1.83万
• 依托单位: Japan Agency for Marine-Earth Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Research Activity Start-up
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-08-31 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22K20392/
• 关键词: seismic inversion; full waveform; Nankai subduction zone; seismic; subsurface imaging; full waveform inversion; slow earthquake

As planned, I have obtained the starting model for full waveform inversion based on the first arrival travel time tomography. There are several things need to be prepared for application of the waveform inversion. First of all, the seismic data need to be preprocessed. Low signal to noise ratio of the original data bring in difficulties to the inversion and may cause artifacts. So I denoised the data properly. Another issue is the source wavelet for data modeling, which is a key for the inversion. I have tested several method to build up the source wavelet, and did the forward modeling by use each of them, respectively. After comparison, I chose the best one which can predict the first arrivals properly. After that, I need to design a strategy and run the inversion tests.

按照计划，我已经获得了基于初至走时层析成像的全波形反演的起始模型。波形反演的应用需要做好几方面的准备。首先，需要对地震数据进行预处理。原始资料信噪比低，给反演带来困难，可能产生伪影。所以我对数据进行了适当的降噪处理。另一个问题是震源子波的数据建模，这是反演的关键。试验了几种构造震源子波的方法，并分别用它们进行了正演模拟。经过比较，我选择了一个最好的，可以预测的第一个到达。在那之后，我需要设计一个策略并运行反转测试。

项目成果

University Grenoble Alpes/Institut des Sciences de la Terre(フランス)

格勒诺布尔阿尔卑斯大学/大地科学研究所（法国）

The application of full waveform inversion in marine seismology: from industry to tectonics

全波形反演在海洋地震学中的应用：从工业到构造

• 发表时间: 2023
• 作者: Yanfang Qin