S21A-4413:
Numerical experiment on Observation Capabilities of Oceanographic Radar for Far Field Tsunami Off Chile
Tuesday, 16 December 2014
Megumi Okamoto1, Tomoyuki Takahashi1, Shuji Seto1, Hirofumi Hinata2 and Tomoya Kataoka3, (1)Kansai University, Osaka, Japan, (2)Ehime University, Matsuyama, Japan, (3)National Institute for Land and Infrastructure Management, Yokosuka, Japan
Abstract:
On March 1st 2014, the Iquique Earthquake of Mw 8.2 occurred off the coast of north Chile. The small tsunami propagated on the Pacific Ocean and arrived at Japan. We installed two Oceanographic Radars in the Kii Peninsula, Wakayama Prefecture and have observed tsunamis from 2012. We analyzed observed data when the tsunami might be reached the area of our observation, however no tsunami was detected. And we carried out numerical modeling on the far field tsunami. Because the computed velocity near the radars was smaller than the critical observable velocity (4.8 cm/s), we couldn’t recognize the tsunami obviously. To study performance of observation of our Oceanographic Radars for the far field tsunamis off the coast of Chile, we chose largest earthquake of M9.5 generated in 1960. We confirm whether the largest tsunami can be detected by the radars. In addition, we examine suitable place to observe the far field tsunamis. We believe that an improvement of tsunami detection technology by using Oceanographic Radar can increase reliabilities of tsunami warning and searching severe damaged areas, then we hope to contribute to upgrading tsunami disaster mitigation.
