1. Atmosphere and Ocean Research Institute University of Tokyo Chiba, Japan
2. Water and Environmental Research Institute of the Western Pacific University of Guam Mangilao 96923, Guam
3. Institute for Geophysics Jackson School of Geosciences University of Texas Austin, TX 78705, U.S.A.
4. USGS Pacific Coastal and Marine Science Center Santa Cruz, CA 95060, U.S.A.