Shallow Tremor Activity in the Hyuga-nada Region after the 2016 Kumamoto Earthquake Revealed by Ocean Bottom Seismological Observation

Saki Watanabe, Kyushu University, Fukuoka, Japan, Yusuke Yamashita, Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, Tomoaki Yamada, Earthquake Research Institute, The University of Tokyo, Tokyo, Japan and Masanao Shinohara, National Research Institute for Earth Science and Disaster Resilience/Earthquake Research Institute, The University of Tokyo, Tokyo, Japan