Active source tomography at Mt. Vesuvius: Constraints for the magmatic system

摘要: [1] Recently, Mt. Vesuvius has been the subject of renewed seismological studies designed to allow definition subsurface structure, focusing on location and geometry a presumed shallow magma chamber. The high volcanic risk associated with activity motivates detailed trace possible magmatic supply at depth that could feed future eruptions. In 1994 1996 two active seismic surveys were carried out by an international team scientists. Body waves from 17 shots executed around volcano recorded dense arrays stations located across extending surrounding Apenninic belt. These experiments encountered logistic difficulties due highly populated area; nevertheless, good-quality data set waveforms was collected. this work we present three-dimensional P wave velocity structure upper crust beneath Vesuvius, obtained through tomographic inversion collected during TomoVes surveys. Due problem, used technique allows ray tracing in complex model both sharp discontinuities gradients. shot station distribution presence very discontinuity, producing head first arrivals, limited analysis 3 km crust. images show well-resolved, main axial high-Vp body interpreted as intrusion remnant recent eruptions central crater. Lateral branches depart anomaly, possibly indicating path followed lateral occurred past.