@article{oai:repository.dl.itc.u-tokyo.ac.jp:00032974, author = {Mizoue, Megumi and Nakamura, Isao and Yokota, Takashi}, issue = {4}, journal = {東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo}, month = {Mar}, note = {application/pdf}, pages = {653--686}, title = {Mapping of an Unusual Crustal Discontinuity by Microearthquake Reflections in the Earthquake Swarm Area near Ashio, Northwestern Part of Tochigi Prefecture, Central Japan}, volume = {57}, year = {1986} }