Authors
Pavel Borodin
Arti observatory, Institute of Geophysics, Urals Branch of Russian Academy of Sciences
Oleg Kusonski
Arti observatory, Institute of Geophysics, Urals Branch of Russian Academy of Sciences
Antonio Mucussete
Direcção Provincial de Recursos Minerais, Nampula, Moçambique
John Riddick
Retired from British Geological Survey, Seismology and Geomagnetism
