Department of Applied Geophysics, Faculty of Natural Sciences, Charles University, Albertov 6, Prague 2, 12843 Czech Republic; Institute of Geology, Academy of Sciences of the Czech Republic, Rozvojova 135, Prague 6, 16502 Czech Republic
NASA - Goddard Space Flight Center, Code 691, Greenbelt, MD 20771, USA
Department of Applied Geophysics, Faculty of Natural Sciences, Charles University, Albertov 6, Prague 2, 12843 Czech Republic
Institute of Geology, Academy of Sciences of the Czech Republic, Rozvojova 135, Prague 6, 16502 Czech Republic
NASA - Goddard Space Flight Center, Code 691, Greenbelt, MD 20771, USA