2012 年 68 巻 2 号 p. I_196-I_200
High frequency ocean surface radar observation reveals the velocity fields of propagating tsunami waves and subsequent 30-40 minute period natural oscillation in the Kii Channel, Japan induced by the March 11, 2011 moment magnitude 9.0 Tohoku-Oki earthquake. Technical issues of the ocean surface radar system concerning the detection of tsunami waves and natural oscillation velocities are also discussed.