DOI: 10.5061/dryad.6wwpzgncc
title: Supporting data of SWOT detects dispersive tsunami tied to near-trench tsunamigenesis in 2025 Kamchatka earthquake

description: 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.
description: # 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 files of the sensitivity analysis of
 section 4 are located in file
 Elliptical_sensitivity_analysis_(section_4).zip:**
 Initial_surface_b0_kajiura_included.xyz\
 Initial_surface_b50p_kajiura_included.xyz\
 Initial_surface_b100_kajiura_included.xyz **SWOT Data is located in file
 SWOT_no_background.zip:** SWOT_asc_267_f.mat **InSAR data is located in
 file** **InSAR_data.zip:** InSAR1_T60F419.txt\ InSAR2_T111F165.txt\
 InSAR3_T9F159.txt\ InSAR4_T60Fxx.txt\ InSAR5_T111F171.txt **DART data is
 located in file** **DART_Records.zip:** 21414.mat\ 21418.mat\ 21419.mat\
 21415.mat\ 21416.mat **SWOT background removal files are located in file
 Removal_background.zip:** remove_background_zenodo.ipynb\
 Zenodo_datafiles.zip **Animations are located in file** **videos.zip:**
 Movie2_3D_animation_preferred_model.mp4\
 Movie1_Comparison_dispersive_nondispersive.mp4  ### Files and variables
 #### File: InSAR_data.zip **Description:** InSAR processed data. Unwrapped
 InSAR data showing land displacements along Line-of-Sight (LOS). InSAR
 data was processed to remove atmospheric noise. Files also contain
 information of LOS components to be used in the earthquake slip
 inversion.  #### File: Preferred_Slip_Model_and_Tsunami_(section_3).zip
 **Description:** Files to carry out forward tsunami simulations. In this
 folder, we provide the initial tsunami elevation in a .xyz format that can
 be used to run forward tsunami models. We also share the finite fault
 model with values of slip for the different sub-faults used in the study.
 They can be used in a dislocation model. Bathymetry data for the tsunami
 model is also provided. Finally, we also share some outputs to compare
 with other forward tsunami simulations (at minutes 67 to 71).  #### File:
 DART_Records.zip **Description:** Processed DART records. These are the
 records of the DART buoys employed in the study. The records are de-tided
 and referenced to UTC time. #### File: SWOT_no_background.zip
 **Description:** Processed SWOT image. This is the SWOT data employed in
 the inversion. The SWOT raw data was processed to remove other ocean
 signals, as explained in the supplementary material of the manuscript.
 #### File: Removal_background.zip **Description:** Signal processing codes
 for removing background in SWOT image. Codes to remove other ocean signals
 from the SWOT raw data. #### File: videos.zip **Description:** Videos of
 model. We share two videos that are described in the supplementary
 material of the manuscript. #### File:
 Elliptical_sensitivity_analysis_(section_4).zip **Description:** Files to
 simulate tsunami. Initial tsunami elevation of simplified slip models used
 in section 4. These files can be used to run forward tsunami simulations. 
 ## Code/software Codes for removing background in SWOT image are provided
 in Python.