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  • Presentation | G14A: Seafloor Geodesy: Recent Technology Development and Research Advances II Oral
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  • G14A-05: First Results from the IDOOS Offshore Geodetic Experiment Reveal Near-Trench Interplate Coupling in Northern Chile (invited)
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Author(s):
Marcos Moreno, Pontificia Universidad Católica de Chile (First Author, Presenting Author)
Dietrich Lange, GEOMAR Helmholtz Centre for Ocean Research Kiel
Oscar Pizarro, Instituto Milenio de Oceanografia (IMO), Universidad de Concepcion
Osvaldo Ulloa, Instituto Milenio de Oceanografia (IMO), Universidad de Concepcion
Juan Carlos Baez, University of Chile
Juan Diaz-Naveas, Pontifical Catholic University of Valparaíso
Daniel Melnick, Universidad Austral de Chile
Valeria Cortes-Rivas, Pontificia Universidad Católica de Chile
Nadin Ramirez, Instituto Milenio de Oceanografia (IMO), Universidad de Concepcion
Isabel Urrutia, Instituto Milenio de Oceanografia (IMO), Universidad de Concepcion
Arne Warwel, GEOMAR Helmholtz Centre for Ocean Research Kiel
Francisco Ortega-Culaciati, University of Chile
Meng (Matt) Wei, University of Rhode Island Narragansett Bay
Erik Fredrickson, University of Texas at Austin
Heidrun Kopp, GEOMAR Helmholtz Centre for Ocean Research Kiel


Understanding how tectonic plates move and lock together beneath the ocean is essential for improving earthquake hazard assessments, especially in regions prone to large subduction earthquakes like northern Chile. In this study, we present the first results from the Integrated Deep-Ocean Observing System (IDOOS), a new offshore geodetic network designed to monitor seafloor deformation near the trench. By recovering nearly two years of continuous pressure data from deep-sea sensors installed off the coast of Taltal, we detected steady vertical motions of the seafloor. These include subsidence near the trench and uplift farther offshore, which match signals seen on nearby land-based GPS stations. This pattern suggests that the tectonic plates are strongly coupled very close to the trench, but only within a narrow offshore zone. These observations provide the first direct measurements of how and where the plates are stuck offshore northern Chile—information that was previously uncertain due to the lack of seafloor data. The results will help improve future models of earthquake behavior and deformation in one of the world’s most active seismic regions.



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