*Tatsuya Mizuta¹, Tomomi Okada¹, Martha K Savage², Ryota Takagi¹, Keisuke Yoshida¹, Hiroshi Yakiwara³, Takeshi Matsushima⁴, Hiroshi Katao⁵, Yoshiko Yamanaka⁶, Masahiro Kosuga⁷, Kei Katsumata⁸, Mako Ohzono⁸, Takashi NAKAYAMA¹, Satoshi Hirahara¹, Toshio Kono¹, Toru Matsuzawa¹, Group for the aftershock observations of the 2011 off the Pacific coast of Tohoku Earthquake (1.Tohoku University , 2.Victoria University of Wellington, 3.Kagoshima University, 4.kyushu University, 5.Kyoto University, 6.Nagoya University, 7.Hirosaki University, 8.Hokkaido University)

*Masayuki Murase¹, Fumiaki Kimata², Yoshiko Yamanaka³, Takeshi Matsushima⁴, Hitoshi Yamashita Mori¹, Daisuke Sato¹, Takahiro Kunitomo³, Yuta Maeda³, Shinichiro Horikawa³, Takashi OKUDA³, Kenjoro Matsuhiro³, Kazushi Tanoue³, Kazunari Uchida⁴, Shin Yoshikawa⁵, Hiroyuki Inoue⁵, Takahiro Yanada⁶, Takahiro Kako^1,6, Hiroyuki Ishimori⁶ (1.Department of Earth and Environmental Sciences, College of Humanities and Sciences, NIHON University, 2.Tono Research Institute of Earthquake Science, 3.Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University, 4.Institute of Seismology and Volcanology, Kyushu University. , 5.Aso Volcanological Laboratory , Kyoto University, 6.Japan meteorological agency)

*Ayaka Tagami¹, Tomomi Okada¹, Shin'ichi Sakai², Mako Ohzono³, Kei Katsumata³, Masahiro Kosuga⁴, Yoshiko Yamanaka⁵, Hiroshi Katao⁶, Takeshi Matsushima⁷, Hiroshi Yakiwara⁸, Takashi NAKAYAMA¹, Satoshi Hirahara¹, Toshio Kono¹, Shu'ichiro Hori¹, Toru Matsuzawa¹, Group for the aftershock observations of the 2011 off the Pacific coast of Tohoku Earthquake (1.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University., 2.Earthquake Research Institute, University of Tokyo, 3.Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, 4.Graduate School of Science and Technology, Hirosaki University, 5.Graduate School of Encironmental Studies, University of NAGOYA, 6.Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University, 7.Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University, 8.Nansei-toko Observatory for Earthquakes and Volcanoes, Kagoshima University)

*Yoshiko Yamanaka¹, Shinichiro Horikawa¹ (1.Graduate School of Encironmental Studies, University of NAGOYA)