| Abstract Submission No. | ABS-3.1-0181 |
| Title of Abstract | SWOT imaging of the tsunami caused by the 29 July 2025, Mw=8.8 Kamchatka Earthquake |
| Authors | Krishna DVP*, Sreejith KM*, Ratheesh Ramakrishnan* |
| Organisation | Space Applications Centre (SAC-ISRO) |
| Address | Room no: 31, Building no: 41, GSD/PGSG/EPSA, Space Applications Centre, Jodhpur Tekra Ahmedabad, Gujarat, India Pincode: 380015 E-mail: dvamsiiist@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | The 29 July 2025, Mw 8.8 Kamchatka (Russia) earthquake caused a major tsunami in the east Pacific Ocean. We use the sea surface height measurements from the recently launched wide-swath satellite altimeter, Surface Water and Ocean Topography (SWOT) mission, to extract the tsunami signal. The ascending pass (P0267) of the SWOT mission captured the perturbation on the ocean surface in two-dimensions after about 70 min. The tsunami signal sampled by SWOT has a peak amplitude of 0.7 m spread across a horizontal distance of ~250 km. We compare the tsunami signal extracted from SWOT with the wave fields simulated using seafloor deformation computed from uniform and distributed co-seismic slip models. SWOT observations could capture major features of the simulated wave field correspnding to the distributed slip model with a correlation coefficient of r = 0.81. Whereas, the tsunami waves simulated using uniform slip model could not explain well the SWOT observations (r=0.65). Our results suggest that tsunami observations from SWOT could be useful for modeling the earthquake source charecterstics. In addition, the wide-swath measurements from SWOT provided the two-dimensional details of the tsunami wave field that could contribute in the detection and mitigation of tsunami-related hazards. |
| Keywords | SWOT mission, wide-swath measurements, tsunami events |