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

• 成果类型: Article
• 署名作者: Ozawa, Shinzaburo; Munekane, Hiroshi; Suito, Hisashi; Yarai, Hiroshi
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12370
• DOI: 10.1126/science.adu7076
• 发表日期: 2025-06-26
• 页码: 1401-1405
• 关键词: fault slip; spatial-distribution; slow; events; inversion; rupture

摘要

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.