FIELD OBSERVATIONS OF OCEAN LONG WAVES OFF WEST OF KYUSHU

Abstract

 Field observations of ocean long waves propagating eastward were made in winter to early spring of 2012 and 2018 in relation to the occurrence of secondary undulation at the west coast of Kyushu. The period of secondary undulations at Nagasaki, Sakitsu, Kami-koshiki Island and Makurazaki were confirmed from the observational results. Moreover, it was suggested that the field observations of sea-level variations at Fukuejima Island and Meshima Island (Uttchima Island and Nakano-shima Island) are useful to monitor ocean long waves causing secondary undulation at Nagasaki and Kami-koshiki Island (Makurazaki).