日本国土地理信息院Shinzaburo Ozawa团队研究了2024年日本西南部日向滩7级地震前、中、后期的板块间滑动。这一研究成果于2025年6月26日发表在《科学》杂志上。

利用全球卫星导航系统数据，研究组分析了2024年日本日向滩地震前、中、后期的板块间滑动。地震前，从2023年底开始，在主震的下倾延伸处观测到一次6.0级（Mw）的慢滑事件（SSE）。

同震滑动与1996年日向滩震源相邻。余震在震源区附近和主震的下倾延伸处消退，在2024年9月16日达到6.7级。在地震发生前，滑裂前区SSE的重现周期从过去30年观测估计的平均2年缩短到1年，这与南海大型逆冲区构造减弱的归因模拟结果一致。

附：英文原文

Title: Interplate slip before, during, and after the 2024 Mw 7 Hyuga-nada earthquake, southwest Japan

Author: Shinzaburo Ozawa, Hiroshi Munekane, Hisashi Suito, Hiroshi Yarai

Issue&Volume: 2025-06-26

Abstract: Using Global Navigation Satellite System data, we investigated the interplate slip before, during, and after the 2024 Hyuga-nada earthquake in Japan. Before the earthquake, a moment magnitude (Mw) 6.0 slow-slip event (SSE) was observed from late 2023 in a downdip extension of the mainshock. The coseismic slip was adjacent to the 1996 Hyuga-nada earthquake source. The afterslip resolved near the hypocenter area and in the downdip extension of the mainshock, reaching Mw 6.7 on 16 September 2024. Leading up to the earthquake, the recurrence interval for SSEs in the preslip area shortened from an average of 2 years, estimated from observations over the past 30 years, to 1 year, consistent with simulations in which the weakening of the Nankai megathrust was attributed to the cause.

DOI: adu7076

Source: https://www.science.org/doi/10.1126/science.adu7076