2023 Fiscal Year Final Research Report
Evaluation of aftershock activity based on strain energy changes
| Project/Area Number |
19K04022
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17040:Solid earth sciences-related
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| Research Institution | National Research Institute for Earth Science and Disaster Prevention |
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Principal Investigator |
Tanaka Sachiko 国立研究開発法人防災科学技術研究所, 地震津波火山ネットワークセンター, 主任研究員 (30551535)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 歪みエネルギー / 余震活動 |
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| Outline of Final Research Achievements |
This study focused on shear strain energy changes caused by large earthquakes and examined their influences on the locations of aftershocks. Not all cases show significant correlations between them. However, clear correlations were observed for the sequences which had relatively large aftershock areas. This suggests that the locations of aftershocks excluding near-field events can be effectively controlled by increases of shear strain energy induced by the mainshocks.
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| Free Research Field |
地震学
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| Academic Significance and Societal Importance of the Research Achievements |
通常，余震の規模は本震と比べると一回り小さいが，追加的な被害を生じさせるような大きな余震が発生する場合もある．本研究では，本震によって生じる歪みエネルギーの変化と余震活動の空間的な広がりや分布との対応関係を評価し，特に余震活動が広範囲に及ぶ場合に歪みエネルギーの増加の寄与が大きいことを明らかにした．余震活動を支配する物理法則を明らかにすることは，その予測精度を向上させ，被害を軽減する上でも重要である．
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