Institute of Geophysics, National Central University, No. 300, Jhongda Rd, Jhongli, TW 325, Taiwan ; Department of Geophysics, Stanford University, 397 Panama mall, Michell Building B59, stanford, CA 94305, United States
Department of Geophysics, Stanford University, 397 Panama mall, Michell Building B59, stanford, CA 94305, United States
U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo park, CA 94025, United States
Institute of Geophysics, National Central University, No. 300, Jhongda Rd, Jhongli, TW 325, Taiwan