1. Department of Earth Sciences, Durham University, Science Site, DH1 3LE, Durham, UK
2. Department of Earth Sciences, Uppsala University, 752 36 Uppsala, Sweden
3. Department of Geophysical Engineering, The Faculty of Mines, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
4. Department of Earth Science, University of Bergen, Allegaten 41, N-5007 Bergen, Norway