A regional and local geophysical study of the western overthrust belt in North-Western Huanuco, North Peru

Abstract

The complicated tectonic history of Northern Huanuco poses great difficulties for geophysical studies in the area. A terrain-corrected, regional Bouguer gravity map of the area has been produced which reflects this complexity. This map is dominated by a northwest grade, which is apparently the result of a Paleozoic tectonic boundary. This boundary seems to have at least locally exerted control on younger features leading to considerable superposition of structures in the area. The Andean chain straddles the western coast of the South American continent, parallel to a subduction zone where the Nazca plate descends beneath the South American continental plate. The area of our research was located in the northern part of the Huanuco province. Four sites were surveyed. The gravity values were calculated dataset and Bouguer corrections were applied. Finally, a Bouguer anomaly map of Peru and Bouguer anomaly maps of sites was produced based on these data.

Keywords

• gravity data
• magnetic data
• local anomaly