The Slip Distributions of the 1952 and 2025 Kamchatka Earthquakes From Tsunami Waveforms Recorded Around the Pacific Ocean

Abstract The July 2025 Kamchatka earthquake (Mw 8.8) generated Pacific‐wide tsunamis. Inversion of 40 DART bottom pressure records revealed a large (∼9 m) slip at 200–400 km southwest of the epicenter. This model reproduces the local geodetic data, and is similar to other finite fault models based on teleseismic and geodetic data. Inversion of the tide gauge data also shows a similar slip distribution. In this region, a great megathrust earthquake ( M ∼ 9) occurred in 1952, and produced similar tsunami waveforms at tide gauge stations. We also made an inversion of the 1952 tide gauge data, considering clock correction at each station, the elasticity of the Earth and sea water, and the station corrections. The result shows that the 1952 slip distribution is similar to that of 2025, except for the depth of the largest slip and the northern slip where foreshock and aftershocks occurred in 2025.