1. Extreme Natural Phenomena RIKEN Hakubi Research Team RIKEN Cluster for Pioneering Research Wako Japan
2. Division of Electrical, Electronic and Infocommunications Engineering Graduate School of Engineering Osaka University Suita Japan
3. Department of Earth and Planetary Environmental Science The University of Tokyo Tokyo Japan
4. Kobayashi‐Maskawa Institute for the Origin of Particles and the Universe Nagoya University Nagoya Japan