Two-way travel (TWT) time retrievals of subsurface reflectors in Phlegra Montes, Mars using SHallow RADar (SHARAD)

This dataset supports the 2025 study titled “Regional ice-depth and thickness in Phlegra Montes, Mars from radar characterization of glacial landsystems using SHARAD” by C.N. Andres and I.B. Smith (https://doi.org/10.1029/2024JE008830). This repository provides two complementary datasets of two-way travel time (TWT) values used to investigate the surface and subsurface radar picks of viscous flow features (VFFs) or debris-covered glaciers in the Phlegra Montes region of Mars. TWT picks (or horizons) were exported from Seisware v10.8. Version 1 of the dataset includes Ice_subsurface_TWT.csv – Contains subsurface radar TWT values derived from SHARAD radargrams' basal reflectors (bottom of the glacier). MOLA_surface_TWT.csv – Contains surface TWT values from from SHARAD radargrams snapped to MOLA topography. Each dataset includes X, Y (projected coordinates), latitude, longitude, and the respective TWT values. Together, these data enable quantitative comparisons and estimations of dielectric permittivity values and/or ice thickness with surface elevation, supporting ice-volume estimates.