作者单位:Department of Geology Faculty of Science and Technology University of the Basque Country (UPV/EHU)[1]Istituto Nazionale di Geofisica e Vulcanologia[2]Department of Mining and Metallurgical Engineering Bilbao School of Engineering University of the Basque Country (UPV/EHU)[3]Università Degli Studi di Firenze[4]