Result from depth-migrated seismic profile offshore “Tierra del Fuego”, Argentina (54° 25’ S).

COMINGUEZ, A. H.; TASSONE, A..; LODOLO, E.

Buenos Aires.

Congreso; XXII Reunión Cientifica de la Asociación Argentina de Geofísicos y Geodestas (AAyGG); 2004

AAGyG

Within the framework of the TESAC Project (Tectonic Evolution of the South America-Scotia plate boundary during the Cenozoic), about 900 km of multichannel seismic reflection profiles were acquired off the Atlantic coast of the Tierra del Fuego Island. The profiles cut across the South America-Scotia plate boundary, a transform margin which traverses in an E-W direction the Island. Data processing and interpretation of one segment of a seismic reflection profile is presented in this contribution. The pre-stack data processing included: (1) re-format; (2) re-sampling; (3) amplitude recovery; (4) data sorting; (5) spike deconvolution on CDP gathers; (6) semblance velocity analyses; (7) normal move-out correction; (8) mute; (9) stack; (10) three traces mixing; (11) time variant filter and trace equalization. The post-stack processing involved depth-migration of the seismic section, using an interval-velocity model of the upper Crust adjusted by iterative processing. An interpreted seismic-velocity section (which trends roughly NW-SE), shows a complex superposition of different tectonic structures, with presence of extensional, compressional and transtensional features in the area located to the north of Isla de los Estados.