*Kenji SATAKE¹ (1. Earthquake Research Institute, the University of Tokyo)

*Shuichi KODAIRA¹ (1. Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

*Tomohisa OKAZAKI¹ (1. RIKEN Center for Advanced Intelligence Project)

*Tomoaki NISHIKAWA¹ (1. Disaster Prevention Research Institute, Kyoto University)

*Yuchen WANG¹, Kentaro Imai¹, Yutaka Hayashi², Hiroki Horikawa¹ (1. Japan Agency for Marine-Earth Science and Technology, 2. Meteorological Research Institute)

*Ryoichiro AGATA¹ (1. JAMSTEC)

*Yuki KODERA¹ (1. Meteorological Research Institute, Japan Meteorological Agency)

*Fumiaki TOMITA¹ (1. IRIDeS, Tohoku University)

*Toshitaka BABA¹, Kenji Satake², Phil R. Cummins³, Sebastien Allgeyer³, Tatsuhiko Saito⁴, Hiroaki Tsushima⁵, Kentaro Imai⁶, Kei Yamashita⁷, Naotaka Chikasada⁴, Masaaki Minami⁵, Ayumu Mizutani⁸, Toshihiro Kato⁹ (1. Tokushima University, 2. Earthquake Research Institute, the University of Tokyo, 3. Australian National University, 4. NIED, 5. MRI, 6. JAMSTEC, 7. then at Tohoku University, now at Nuclear Regulation Agency, 8. Tohoku University, 9. NEC)

Toshihiko Kanazawa¹, *Hajime SHIOBARA¹, Masanao Shinohara¹, self-popup OBS development team² (1. Earthquake Research Institute, the University of Tokyo, 2. N/A)

*Takashi Kunugi¹, Shin Aoi¹, Hiromitsu Nakamura¹, Wataru Suzuki¹, Nobuyuki Morikawa¹, Hiroyuki Fujiwara¹ (1. National Research Institute for Earth Science and Disaster Resilience)

*Eiichi FUKUYAMA^1,2, Futoshi Yamashita¹, Shiqing Xu³, Kazuo Mizoguchi^4,1, Hironori Kawakata^5,1, Kurama Okubo¹, Sumire Maeda^6,1 (1. NIED, 2. Kyoto Univ., 3. SUSTech, 4. CRIEPI, 5. Ritsumeikan Univ., 6. AIST)

*Eiichiro ARAKI¹, Tomokazu Saruhashi¹, Masanori Kyo¹, Yuya Machida¹, Toshinori Kimura², Kazuya Kitada¹, Shuhei Tsuji¹, Takashi Yokobiki¹, Noriaki Sakurai¹, Takahiro Yokoyama¹ (1. JAMSTEC, 2. TEPCO)