Anita Di Chiara, Istituto Nazionale di Geofisica e Vulcanologia, Palermo, Italy, Lisa Tauxe, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States, Hubert Staudigel, Scripps Institution of Oceanography, La Jolla, CA, United States, Marino Protti, Observatorio Vulcanológico y Sismológico de Costa Rica, Heredia, Costa Rica and Fabio Florindo, INGV-ROME, Rome, Italy