MONITORING OF LONG-PERIOD WAVE IN THE WESTERN REGION OF KAGOSHIMA FOR SECONDARY UNDULATION PREDICTION

Abstract

 Direct measurement of sea level at Meshima Island during February 10 – March 27 in 2012 and at Uji Island during February 1 – March 31 in 2016 were made in relation to the occurrence of secondary undulation at the west coast of Kagoshima. We found that the secondary undulations with the periods of 12 and 24 minutes at Koshiki Island and the period of 16 minutes at Makurazaki are dominant. Moreover, it was suggested that the monitoring of sea-level variation with the periods of 8 – 32 minutes at Meshima Island and Uji Island is useful to the prediction of the approach of long-period wave to cause the secondary undulation at Koshiki Island and Makurazaki.