Introduction of uncertainty of Green's function into multi-data inversion for seismic source processes

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540450
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: University of Tsukuba
• Principal Investigator: YAGI Yuji 筑波大学, 生命環境系, 准教授 (50370713)
• Co-Investigator(Kenkyū-buntansha): FUKAHATA Yukitoshi 京都大学, 防災研究所, 准教授 (10313206)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 震源過程解析 / モデル誤差

Outline of Final Research Achievements

Seismic source models are essentially important to reveal the characteristics of earthquakes. Now, the waveform inversion becomes a popular tool to construct seismic source models. As pointed out by some researchers, however, seismic source models for the same earthquake are often quite different from one another. This suggests that the existing formulations of the inverse problem have some crucial flaws. In principle, we can never know the true Green’s function, which is a major error source in seismic source inversion. Therefore, we introduce uncertainty of Green’s function into seismic source inversion analyses, and then proposed the multiple data integration method. In addition to this, we developed a hybrid back-projection method to estimate stable seismic source image.

Free Research Field

固体地球物理学