Abstract

Accurate and precise 3-D geometry models of subduction zone plate boundaries are crucial for advancing earthquake science, enhancing hazard assessments, and improving our understanding of geodynamics. Despite extensive studies, the offshore portion of subduction interfaces is usually poorly constrained due to the limited use of available marine constraints in current models. Here, we present a new 3-D offshore geometry of the Nazca-South AMerica (NSAM) subduction interface off western South America based on a comprehensive compilation of offshore active seismic data. We use 66 multi-channel, and 30 wide-angle seismic profiles acquired from Colombia (4°N) to southern Chile (46°S), covering a margin-length of 6,000 km, to generate a high-precision mesh (± 0.5 km). This data product contributes to scientific and applied research on one of the longest and most active subduction zones on Earth and enhances our understanding of global subduction zone processes and geohazards. © 2024