| 研究課題/領域番号 |
22K20392
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| 研究種目 |
研究活動スタート支援
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| 配分区分 | 基金 |
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| 審査区分 |
0204:天文学、地球惑星科学およびその関連分野
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| 研究機関 | 国立研究開発法人海洋研究開発機構 |
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研究代表者 |
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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| 研究期間 (年度) |
2022-08-31 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
2,860千円 (直接経費: 2,200千円、間接経費: 660千円)
2023年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
2022年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
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| キーワード | seismic inversion / full waveform tomography / full waveform / Nankai subduction zone / seismic / subsurface imaging / full waveform inversion / slow earthquake |
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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
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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| 今後の研究の推進方策 |
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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