1. Department of Physics Graduate School of Science Kyoto University Kyoto‐shi Kyoto Japan
2. Division of Electrical, Electronic and Infocommunications Engineering Graduate School of Engineering Osaka University Osaka‐shi Osaka Japan
3. Department of Earth and Planetary Environmental Science The University of Tokyo Bunkyo‐shi Tokyo Japan
4. Kobayashi‐Maskawa Institute for the Origin of Particles and the Universe Nagoya University Nagoya‐shi Aichi Japan
5. Graduate School of Science and Engineering Aoyama Gakuin University Sagamihara‐shi Kanagawa Japan
6. Extreme Natural Phenomena RIKEN Hakubi Research Team RIKEN Cluster for Pioneering Research Wako‐shi Saitama Japan