Evaluation of the microseismic motion at the KAGRA site based on the ocean wave data

Abstract

The microseismic motion, which is the ambient ground vibration caused by ocean waves, affects ground-based gravitational detectors. In this study, we characterized the properties of the microseismic motion at the KAGRA site and the ocean waves at 13 coasts of Japan, such as the seasonal variation and the correlation between them. As a result, it almost succeeded to explain the microseismic motion at the KAGRA site by the principal components of the ocean wave data. One possible application of this study is the microseismic forecast and its example is also shown