1. Department of Earth Sciences University of Turin Turin Italy
2. Istituto Nazionale di Geofisica e Vulcanologia Sezione di Catania ‐ Osservatorio Etneo Catania Italy
3. Rock Mechanics Laboratory School of Earth and Environmental Sciences University of Portsmouth Portsmouth UK
4. Institute of Geosciences Johannes Gutenberg University Mainz Germany
5. Department of Geology and Petroleum Geology School of Geosciences King's College University of Aberdeen Aberdeen UK