Tianshi Liu¹, Kai Wang², Ping Tong³, Carl Tape⁴ and Qinya Liu³, (1)University of Toronto, Department of Earth Sciences, Toronto, ON, Canada, (2)University of Toronto, Department of Physics, Toronto, ON, Canada, (3)University of Toronto, Toronto, ON, Canada, (4)University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States