ocean-trenches

GMT (Generic Mapping Tools) shell scripts building 3D perspective relief models of the Kuril-Kamchatka Trench: grdview topographic/bathymetric meshes from ETOPO relief overlaid on 2D EGM96 geoid contours, rendered at two perspective azimuths (135 and 165 degrees).

GMT (Generic Mapping Tools) shell scripts extracting and stacking serial cross-track bathymetric profiles across the Kuril-Kamchatka Trench (north and south segments) with grdtrack, plotting median stacked profiles with error envelopes over a shaded-relief basemap.

Over 20 GMT (Generic Mapping Tools) shell scripts fitting polynomial and Fourier regression models to stacked bathymetric trench-profile data by weighted least squares with trend1d, comparing model orders and plotting residuals across many ocean trenches worldwide.

Geomorphometric delineation of physiographic domains at Pacific subduction margins: axis-relative attribute stacks, unsupervised clustering, and reproducible figures.

GMT (Generic Mapping Tools) shell script converting a regularly-spaced XYZ bathymetry table directly to a NetCDF grid with xyz2grd (exact grid registration, no interpolation), then contour-mapping the result for the Kuril-Kamchatka Trench.

Over 25 GMT (Generic Mapping Tools) shell scripts plotting statistical histograms of bathymetric depth distributions sampled along ocean-trench cross-section profiles (mean/sigma, median/L1, LMS-mode overlays via pshistogram) with companion rose diagrams (psrose).

GMT (Generic Mapping Tools) shell script building a faceted side-by-side comparison figure: two map panels contrasting gridding algorithms (xyz2grd direct conversion vs nearneighbor interpolation) of the same Kuril-Kamchatka Trench bathymetry, with shared captions and title.

GMT (Generic Mapping Tools) shell scripts gridding scattered XYZ bathymetry with the nearneighbor local nearest-neighbour / sector-search algorithm and contour-mapping the result for the Kuril-Kamchatka and Mariana Trenches.

GMT (Generic Mapping Tools) shell script mapping the geographic layout of 25 cross-section profiles along the Mariana Trench, plotting profile transects as oriented vectors on an Albers equal-area contour basemap from ETOPO1 relief.

GMT (Generic Mapping Tools) shell scripts drawing oblique Mercator (-JOc) coastline basemaps of the Kuril-Kamchatka and Mariana Trenches, with the projection axis aligned to each trench and graticules, scale bars and toponymy.

GMT (Generic Mapping Tools) shell scripts demonstrating coastline-based raster clipping (pscoast clip paths) to render a colour geoid over the ocean and gray-shaded relief over masked land, for the Kuril-Kamchatka and Mariana Trenches.

GMT (Generic Mapping Tools) shell scripts mapping ETOPO1 bathymetry of the Mariana Trench in three contrasting map projections: Cassini transverse cylindrical (-JC), Cylindrical Equal-Area Gall-Peters (-JY) and Polyconic (-JPoly), with colour scale, contours, toponymy and geometric-shape annotation.

GMT (Generic Mapping Tools) shell scripts interpolating scattered XYZ topography and gravity to continuous grids with blockmean and the surface adjustable-tension continuous-curvature spline algorithm, then shading and mapping the modelled surfaces of the Kuril-Kamchatka and Mariana Trenches.

Over 35 GMT (Generic Mapping Tools) shell scripts producing regional geological and tectonic setting maps: relief basemaps overlaid with trenches, ridges, transform and fracture zones, ophiolites, volcanoes, LIPs, GSFML magnetic lineations, subducting-slab contours and plate-motion vectors, with fault/plate labels and legends.

GMT (Generic Mapping Tools) shell scripts producing bathymetric contour (isobath) maps of ocean trenches from ETOPO relief, with annotated index contours on an Albers equal-area conic projection and study-area outlines.

Over 40 GMT (Generic Mapping Tools) shell scripts extracting and stacking serial cross-track bathymetric profiles across ocean trenches with grdtrack, plotting mean/median stacked profiles with error envelopes over shaded-relief basemaps for trench morphology and geomorphometric analysis.

GMT (Generic Mapping Tools) shell scripts fitting polynomial and Fourier regression models to stacked bathymetric trench-profile data by weighted least squares with trend1d, comparing model orders and plotting residuals for Kuril-Kamchatka Trench geomorphology.

GMT (Generic Mapping Tools) shell scripts producing oblique Mercator (-JOc) coastline basemaps rotated to follow ocean-trench axes / great-circle lines, with graticules and toponymy, for trench regions and a world overview.

Reproducible Python/PyGMT workflow testing the geomorphic imprint of subducting seamounts and ridges on Pacific trenches — axial-depth anomaly, inner-slope scarring and along-strike segmentation — from open bathymetry with statistics and a random-forest classifier.

Over 30 GMT (Generic Mapping Tools) shell scripts building 3D perspective relief models: grdview-rendered topographic and bathymetric meshes and surfaces from ETOPO/GEBCO grids at set azimuth and elevation, often overlaid on 2D geoid contours, for ocean trenches, seas and countries.