National Geophysical Data Center, NOAA, David Skaggs Research Center NOAA/NGDC E/GC2 325 Broadway, Boulder, 80305, United States ; National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India
Institut für Geophysik L3.2, ETH Zurich, HPP Honggerberg, Zurich, 8093, Switzerland