Slow rupture in a fluid-rich fault zone initiated the 2024 Mw 7.5 Noto earthquake

• 成果类型: Article
• 署名作者: Ma, Zhangfeng; Zeng, Hongyu; Luo, Haipeng; Liu, Zemin; Jiang, Yu; Aoki, Yosuke; Wang, Weitao; Itoh, Yuji; Lyu, Mingzhe; Cui, Yan; Yun, Sang-Ho; Hill, Emma M.; Wei, Shengji
• 署名单位: Nanyang Technological University; Nanyang Technological University; Southern University of Science & Technology; China Earthquake Administration; Institute of Geophysics, CEA; University of Tokyo; Universite Gustave-Eiffel; Communaute Universite Grenoble Alpes; Universite Grenoble Alpes (UGA); Centre National de la Recherche Scientifique (CNRS); Institut de Recherche pour le Developpement (IRD); Universite Savoie Mont Blanc; Hohai University; Nanyang Technological University; Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12638
• DOI: 10.1126/science.ado5143
• 发表日期: 2024-08-23
• 页码: 866-871
• 关键词: megathrust; california; DYNAMICS; basin; SEA

摘要

The 2024 moment magnitude 7.5 Noto Peninsula (Japan) earthquake caused devastation to communities and was generated by a complex rupture process. Using space geodetic and seismic observations, we have shown that the event deformed the peninsula with a peak uplift reaching 5 meters at the west coast. Shallow slip exceeded 10 meters on an offshore fault. Peak stress drop was greater than 10 megapascals. This devastating event began with a slow rupture propagation lasting 15 to 20 seconds near its hypocenter, where seismic swarms had surged since 2020 because of lower-crust fluid supply. The slow start was accompanied by intense high-frequency seismic radiation. These observations suggest a distinct coseismic slip mode reflecting high heterogeneity in fault properties within a fluid-rich fault zone.