@article{weko_33717_1, author = "Hagiwara,Takahiro and Karakawa,Ikuo and Kayano,Ichiro and Kaminuma,Katsutada", title = "Foreshocks, Aftershocks and an Earthquake Swarm Detected by the Micro-earthquake Observation", journal = "東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo", year = "1963", volume = "41", number = "3", pages = "659--680", month = "sep" }