Abstract The 29 July 2025 M w 8.8 Kamchatka earthquake generated a trans‐Pacific tsunami. The hypocenter was nearly at the same location as the 1952 great earthquake ( M w 8.8–9.0). Determining whether the 2025 rupture reached the trench and how it relates to the 1952 event is crucial for understanding slip behavior along the Kamchatka subduction zone. We derive the 2025 coseismic slip distribution through a joint inversion of tsunami and GNSS data, accounting for rupture kinematics and second‐order tsunami propagation effects. The unilateral rupture extends approximately 500 km along strike, with a peak slip of about 16 m. Large near‐trench slip of 10–13 m is clearly resolved by the tsunami data. Tide gauge records across a broad region suggest that the 2025 earthquake repeats the trench‐normal pattern of the 1952 slip, while the 1952 rupture may have extended farther northeast along strike.
Zhu et al. (2026) studied this question.