1. Dipartimento di Scienze della Terra, Via Valperga Caluso 35, 10125 Torino, Italy
2. ALP, Alpine Laboratory of Palaeomagnetism, Via Massa 6, 12016 Peveragno (CN), Italy
3. IRD, Laboratoire Magmas et Volcans, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France
4. Department of Geological Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey