[1] Prithvi Bhawan, Minist Earth Sci, Lodhi Rd, New Delhi 110003, India
[2] Natl Ctr Seismol, Minist Earth Sci, EREC Bldg Room,1&2,IMD Campus,Lodhi Rd, New Delhi 110003, India
[3] Grad Univ Adv Studies SOKENDAI, Sch Multidisciplinary Sci, Dept Polar Sci, Natl Inst Polar Res, 10-3 Midori Cho, Tachikawa, Tokyo, Japan