1. CSIR-National Geophysical Research Institute, Hyderabad, India and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.
2. CSIR-National Geophysical Research Institute, Hyderabad, India and Baylor University, Waco, Texas, USA.
3. CSIR-National Geophysical Research Institute, Hyderabad, India and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India. (corresponding author)