*Kaoru SAWAZAKI¹ (1. National Research institute for Earth Science and Disaster Resilience )

*Yuki Susukida¹, Kei Katsumata¹, Masayoshi Ichiyanagi¹, Mako Ohzono¹, Hiroshi Aoyama¹, Ryo Tanaka¹, Masamitsu Takada¹, Teruhiro Yamaguchi¹, Kazumi Okada¹, Hiroaki Takahashi¹, Shin'ichi Sakai², Satoshi Matsumoto³, Tomomi Okada⁴, Toru Matsuzawa⁴, Shuichiro Hirano⁵, Toshiko Terakawa⁶, Shin'ichiro Horikawa⁶, Masahiro Kosuga⁷, Hiroshi Katao⁸, Yoshihisa Iio⁸, Airi Nagaoka⁸, Noriko Tsumura⁹, Tomotake Ueno¹⁰, the Group for the Aftershock Observations of the 2018 Hokkaido Eastern Iburi Earthquake (1. Institute of Seismology and Volcanology, Faculty of Science, Hokkaido University, Sapporo, Japan, 2. Earthquake Research Institute, University of Tokyo, Tokyo, Japan, 3. Institute of Seismology and Volcanology, Kyushu University, Fukuoka, Japan, 4. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Tohoku University, Sendai, Japan, 5. Nansei-Toko Observatory for Earthquakes and Volcanoes, Graduate School of Science and Engineering, Kagoshima University, Kagoshima, Japan, 6. Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan, 7. Earthquake and Volcano Observatory, Hirosaki University, Hirosaki, Japan, 8. Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, 9. Department of Earth Science, Faculty of Science, Chiba University, Chiba, Japan, 10. National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan)

*Koichiro Obana¹, Tsutomu Takahashi¹, Yojiro Yamamoto¹, Gou Fujie¹, Yasuyuki Nakamura¹, Seiichi Miura¹, Shuichi Kodaira¹ (1. JAMSTEC)

*Nobuyuki Morikawa¹, Jun'ichi Miyakoshi², Hiroyuki Fujiwara¹ (1. NIED, 2. Ohsaki Research Institute, Inc.)