Junko Suzuki¹, Shin-Ya Ogino², Ryuichi Shirooka¹, Takenari Kinoshita³, Shuichi Mori⁴, Suginori Iwasaki⁵, Urip Haryoko⁶ and Kunio Yoneyama⁷, (1)JAMSTEC, Kanagawa, Japan, (2)Japan Agency for Marine-Earth, Yokosuka, Japan, (3)Communications Research Lab, Tokyo, Japan, (4)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (5)National Defense Academy, Kanagawa, Japan, (6)BMKG, Jakarta, Indonesia, (7)Japan Ag for Mar Ear Sci & Tec, Yokosuka, Japan