Supporting data of SWOT detects dispersive tsunami tied to near-trench tsunamigenesis in 2025 Kamchatka earthquake

Tsunamis from large subduction earthquakes pose severe coastal hazards, yet their genesis near the trench remains poorly constrained by land-based seismic–geodetic data and distant deep water sensors. Following the 29 July 2025 M8.8 Kamchatka earthquake, the SWOT satellite captured a distinct train of short-wavelength tsunami waves, which we link to near-trench tsunamigenesis. Sensitivity analyses of earthquake slip indicate tsunamigenesis within ~10 km of the trench — an inference not attainable from land geodesy or sparse deep-water seafloor pressure records alone. These results provide the first high-resolution, two-dimensional spaceborne observation directly linking the measured dispersive tsunami wavefield to near-trench tsunamigenesis, extending earlier model and gauge-based inferences. They establish SWOT as a transformative constraint on source processes, with implications for tsunami-hazard science and subduction-zone geodynamics.
, , , # Supporting data of SWOT detects dispersive tsunami tied to near-trench tsunamigenesis in 2025 Kamchatka earthquake

Dataset DOI: [10.5061/dryad.6wwpzgncc](https://doi.org/10.5061/dryad.6wwpzgncc)

## Description of the data and file structure

These are supporting files of the manuscript \"SWOT reveals dispersive tsunami waves linked to near-trench tsunamigenesis in the 2025 Magnitude 8.8 Kamchatka earthquake\". This dataset provides the input data to perform the earthquake slip inversions presented in the paper. Inversion results are also provided so that forward modeling can be carried out by the readership. 

**The supporting files of the preferred model of section 3 are located in the file Preferred_Slip_Model_and_Tsunami_(Section_3)_Version_Final.zip**

Initial_tsunami_elevation.dat\
eta_time_step_67\
eta_time_step_68\
eta_time_step_69\
eta_time_step_70\
eta_time_step_71\
Finite_Fault_preferred_slip.txt\
longitudes_eta.txt\
latitudes_eta.txt\
Bathymetry_data.xyz

**The supporting f...