1. Institute of Applied Mathematics and Information Technologies, Faculty of Science; Charles University in Prague; Prague 2 Czech Republic
2. Institut de Physique de Globe, EOST, UMR 7516; Université de Strasbourg; Strasbourg CEDEX France
3. Center for Lithospheric Research; Czech Geological Survey; Prague 1 Czech Republic
4. Department of Earth Sciences; University of Southern California; Los Angeles California USA