Oceanic crustal thickness in areas of spreading ridges in Drake Passage (Antarctica) from numerical inversion ofgravity data

摘要

The high density of geophysical data (gravity, bathymetry...) collected in the ANTPAC 97/98 cruise by theSpanish BIO Hespérides allows us to obtain the crustal thickness of the areas near the intersection of theShackleton Fracture Zone and the West Scotia Ridge (Z1), and the P2 segment of the Phoenix-AntarcticRidge (Z2) by means of inversion methods. Data were merged with that of the Global Gravity Grid and theGlobal Sea Floor Topography (Sandwell and Smith, 1997). The effect of the bathymetry on the Free Airanomaly was eliminated previously. Differences in the crustal thickness in both areas are presented