Estudio de estructuras corticales superficiales en la isla de San Miguel (Archipiélago de Azores) mediante el análisis de datos gravimétricos

Resum

One of the main challenges arising from the study of active volcanic areas is to determine a model of crustal structures that helps to establish both their origin and the evolution along the different phases of volcanic activity in the area. The analysis of gravity anomalies makes possible to identify the geometry of the edges of these structures, even when others mask their effect. All this information when complemented with other studies, has been proven useful to improve the knowledge of the volcanic history in the study area. We present here a new Bouguer anomaly map of San Miguel Island (Azores) which has been obtained from the gravity data presented in Camacho et al. (1997), improving the processing of the observations and the topographic correction. The analysis of this new map has been carried out through horizontal derivatives and the gradient. These maps are correlated with tectonic elements, showing structures close to the main volcanic calderas, being able to infer their different origins. The results help to clarify the distribution and geometry of shallow structures allowing a better understanding of the volcanic activity in the island. This contribution has been possible thanks to the grant CGL2015-63799-P from the Spanish Ministry of Science and Innovation.