National Central University, Institute of Geophysics, Taoyuan, 320 Taiwan ; US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025 United States
National Central University, Institute of Geophysics, Taoyuan, 320 Taiwan ; US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025 United States
US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025 United States