*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)

*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)

*Sumire Maeda¹, Toru Matsuzawa², Tomomi Okada², Takeyoshi Yoshida², Masahiro Kosuga³, Hiroshi Katao⁴, Makoto Otsubo¹ (1.Research Institute of Earthquake and Volcano Geology, Geological Survey of Japan/AIST, 2.Graduate School of Science, Tohoku University, 3.Graduate School of Science and Technology, Hirosaki University, 4.Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University)

*Rina Ikeda¹, Keisuke Yoshida¹, Ryo Takahashi^2,1, Toru Matsuzawa¹, Akira Hasegawa¹ (1.Tohoku University, 2.Japan Meteorological Agency)

*Tomomi Okada¹, Ayaka Tagami¹, Tatsuya Mizuta¹, Shin'ichi Sakai², Keisuke Yoshida¹, Naoki Uchida¹, Takashi NAKAYAMA¹, Satoshi Hirahara¹, Toru Matsuzawa¹ (1.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, 2.ERI, University of Tokyo)

*Manami Suzuki ¹, Tomomi Okada¹, Akiko Hasemi¹, Toru Matsuzawa¹, Norihito Umino¹, Takashi NAKAYAMA¹, Noriko Tsumura², Tadashi Yamashina³, Group for the aftershock observations of the 2011 off the Pacific of Tohoku Earthquake (1.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, 2.Graduate School of Science, Chiba University, 3.Faculty of Science and Technology, Kochi University)