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Project Nariõ I: Crustal structure under southern Colombian-northern Ecuador Andes from seismic refraction data

INSTITUTO GEOFISICO DEL PERU, LIMA, Peru
UNIVERSITY OF WISCONSIN GEOPHYSICAL AND POLAR RESEARCH CENTER, MADISON, WISCONSIN 53705
CARNEGIE INSTITUTION OF WASHINGTON DEPARTMENT OF TERRESTRIAL MAGNETISM, WASHINGTON, D.C. 20015
INSTITUTO GEOFISICO DE LOS ANDES COLOMBIANOS, BOGOTÁ, Colombia

Abstract

A portion of the Colombian and Ecuadorian Andes associated with lowest values of the regional Bouguer gravity anomaly has been examined as a part of a 1973 multinational seismic refraction experiment, Project Nariño, extending from 5°N to 2°S latitude using a Colombian lake shot point at about latitude 1°N, longitude 77°W. The data from these reconnaissance measurements seem best satisfied by synthetic seismogram record sections computed from models containing low compressional-wave velocity zones. The basic structures in the crust and upper mantle under Colombia and Ecuador are similar. Models from the Peru-Bolivia altiplano, a similar low-gravity region, correlate with those under Colombia and Ecuador.