SEISMIC-GRAVIMETRIC ANALYSIS IN THE SUBDUCTED NAZCA PLATE BETWEEN 32° S AND 36° S

MARÍA LUJÁN ECKERMAN; ALEJO AGUERO; SILVANA SPAGNOTTO; PATRICIA MARTÍNEZ; SILVINA NACIF

Geodesy and Geodynamics

Institute of Seismology, China Earthquake Administration

Año: 2018 vol. 9 p. 57 - 66

1674-9847

The study region is seismically and tectonically characterized by the angle variations in the subduction of the Nazca plate. The results obtained from earthquakes location between 32° and 36°S latitude and between 67° and 71°W longitude are presented in this work. The presence of a wedge of asthenospheric materials and the partial or total eclogitization of the subducted Nazca plate and its relation with isostatic cortex models published was analyzed. In addition, a gravimetric profile obtained from gravity forward modelling is presented at 33.5°S, proposing a new configuration at depths for the main tectonic components: Nazca plate, asthenospheric wedge and South American plate. Also, a new density scheme using recently published velocity models was obtained.