Three-dimensional admittance analysis of lithospheric elastic thickness over the Louisville Ridge

Abstract

Using bathymetry and altimetric gravity anomalies, a 1°9 1°lithospheric effective elastic thickness (T e ) model over the Louisville Ridge and its adjacent regions is calculated using the moving window admittance technique. For comparison, three bathymetry models are used: general bathymetric charts of the oceans, SIO V15.1, and BAT_VGG. The results show that BAT_VGG is more suitable for calculating T e than the other two models. T e along the Louisville Ridge was re-evaluated. The southeast of the ridge has a medium T e of 10-20 km, while T e increases dramatically seaward of the Tonga-Kermadec trench as a result of the collision of the Pacific and IndoAustralian plates.