1. Department of Geophysics and Space Science Eötvös Loránd University Budapest Hungary
2. Kövesligethy Radó Seismological Observatory Institute of Earth Physics and Space Science Sopron Hungary
3. University of Lausanne Institute of Earth Sciences Lausanne Switzerland
4. Department of Earth Sciences ETH Zürich Zürich Switzerland
5. Institute for Geological and Geochemical Research Research Center for Astronomy and Earth Sciences Budapest Hungary