Hoby Njara T. Razafindrakoto, GFZ German Research Centre for Geosciences, Potsdam, Germany, Fabrice Cotton, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, Dino Bindi, Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany, Marco Pilz, GFZ, Potsdam, Germany, Robert W Graves, US Geological Survey, Pasadena, CA, United States and Sanjay Singh Bora, IIT Gandhinagar, Gujarat, India