| Project/Area Number |
22K20392
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0204:Astronomy, earth and planetary science, and related fields
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
Qin Yanfang 国立研究開発法人海洋研究開発機構, 海域地震火山部門(地震発生帯研究センター), 研究員 (20962343)
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| Project Period (FY) |
2022-08-31 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | seismic inversion / full waveform tomography / full waveform / Nankai subduction zone / seismic / subsurface imaging / full waveform inversion / slow earthquake |
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| Outline of Research at the Start |
The subsurface structure of the earthquake zone is always enigmatic, and the underground physical properties are the key
controls of the earthquake rupture process. The aim of this project is to image the detailed subsurface structures that host the very low frequency earthquakes in the Nankai Trough by advanced techniques of exploration seismology. I use dense located ocean bottom seismometer (1-km interval) data acquired in 2018 off the Kii Peninsula, implemented by full waveform inversion method, to extract detailed physical properties of subsurface structure around the seismogenic zone.
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| Outline of Annual Research Achievements |
Since last year, the time-domain FWI program has been running successfully. Following a visit to collaborators in Grenoble Alpes University , I conducted continuous testing of various parameters and employed different strategies. These included, but were not limited to, evaluating uncertainties in observed data (relying on signal-to-noise ratio), refining starting velocity models, and analyzing source signatures.
Diverse outcomes were obtained from different inputs and inversion parameters. To identify the optimal approach, I meticulously compared and analyzed the various results, correlating them with seismic reflection data for comprehensive analysis.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Despite encountering numerous challenges during the data inversion process using advanced FWI, I successfully overcame these obstacles through extensive testing and international communication. I have now obtained a preferred result, and the remaining tasks will primarily involve interpretation and paper writing.
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| Strategy for Future Research Activity |
For the interpretation of my results, I plan to engage in discussions with various geologists, geophysicists, and other interdisciplinary experts. This collaborative effort may necessitate additional tests on the results and allocate computational resources for further analysis. Additionally, I understand the importance of thoroughly reviewing and comprehending recent references pertinent to my research. With these steps in place, I anticipate a smooth progression in my work.
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