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<p>We detected coseismic deformation associated with the 2025 Kamchatka earthquake using the Advanced Land Observing Satellite-2 (ALOS-2) ScanSAR (wide-swath) data. The coseismic deformation revealed predominantly greater than 1.5&#xa0;m of eastward displacement, with less than 0.2&#xa0;m of uplift on the southern Kamchatka Peninsula. Our preferred model shows a shallow, near-trench slip concentration on the order of 10–15&#xa0;m at a depth of 10–20&#xa0;km and a similar along-strike extent to that of the 1952 M9.0 earthquake, as inferred from tsunami or historical records in previous studies. Furthermore, the trenchward rupture in 2025 overlapped the seismic gap observed between January 1970 and June 2025 as well as areas of strong plate coupling, suggesting a decades-long accumulation of slip deficit. In contrast, the upper bound of the slip-deficit budget is insufficient to explain the inferred peak coseismic slip, because the accumulated slip deficit reaches approximately 6&#xa0;m at most, even with full coupling and a convergence rate of 80&#xa0;mm/yr since the 1952 event. The imbalance between the slip-deficit budget and the coseismic slip may reflect an incomplete release of the slip-deficit budget due to the 1952 earthquake or fine-scale slip segmentation in the subduction zone; however, the model resolution is limited and cannot resolve these interpretations uniquely.</p> Graphical Abstract <p></p>

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Shallow segment rupture associated with the 2025 Kamchatka earthquake inferred from ALOS-2/PALSAR-2 InSAR

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  • 发表日期：

    2026年4月14日

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  • Yuji Himematsu,
  • Hiroshi Munekane

摘要

We detected coseismic deformation associated with the 2025 Kamchatka earthquake using the Advanced Land Observing Satellite-2 (ALOS-2) ScanSAR (wide-swath) data. The coseismic deformation revealed predominantly greater than 1.5 m of eastward displacement, with less than 0.2 m of uplift on the southern Kamchatka Peninsula. Our preferred model shows a shallow, near-trench slip concentration on the order of 10–15 m at a depth of 10–20 km and a similar along-strike extent to that of the 1952 M9.0 earthquake, as inferred from tsunami or historical records in previous studies. Furthermore, the trenchward rupture in 2025 overlapped the seismic gap observed between January 1970 and June 2025 as well as areas of strong plate coupling, suggesting a decades-long accumulation of slip deficit. In contrast, the upper bound of the slip-deficit budget is insufficient to explain the inferred peak coseismic slip, because the accumulated slip deficit reaches approximately 6 m at most, even with full coupling and a convergence rate of 80 mm/yr since the 1952 event. The imbalance between the slip-deficit budget and the coseismic slip may reflect an incomplete release of the slip-deficit budget due to the 1952 earthquake or fine-scale slip segmentation in the subduction zone; however, the model resolution is limited and cannot resolve these interpretations uniquely.

Graphical Abstract