Distribution of shallow very low frequency earthquakes in the eastern Nankai trough influenced by a subducted oceanic ridge: Results from cluster analysis applied to ocean bottom seismographs

Akiko Toh, Institute of Earth Sciences Academia Sinica, Taipei, Taiwan, Koichiro Obana, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan and Eiichiro Araki, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Research Institute for Marine Geodynamics, Yokosuka, Japan