Seismic Rupture Surface Model of the August 17, 2024 Shipunsky, Kamchatka, Earthquake

The study presents a rupture surface model of the Shipunsky earthquake, consiting of a single plane with a dip angle of 30°, a strike of 211°, and depths ranging from 25 to 49 km. Compared to the USGS solution, the rupture surface is shifted away from the continent and extended along dip, which corresponds better to the aftershock cloud distribution according to the Kamchatka Branch, Federal Research Center Geophysical Service, Russian Academy of Sciences. The rupture exhibited nearly pure thrust, with a maximum displacement of 0.88 m and an average displacement of 0.79 m, corresponding to a seismic moment of 2.9 × 1019 N m (MW = 6.9). The constructed model shows good agreement with both horizontal and vertical displacements recorded by GPS stations. The model allows for calculation of theoretical displacement fields on the Earth’s surface in the satellite line-of-sight direction. A qualitative comparison with displacements derived from Sentinel-1A radar images was performed.