2024-03-29T09:39:32Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/582482022-11-17T02:08:08Zhdl_2115_58231hdl_2115_13714hdl_2115_1162012年に発生した北海道北部中川町付近の群発地震活動The 2012 Earthquake Swarm in Nakagawa town, northern Hokkaido一柳, 昌義高橋, 浩晃山口, 照寛東, 龍介山田, 卓司大園, 真子眞城, 亮成笠原, 稔谷岡, 勇市郎450An earthquake swarm begun at 15 July 2012 in Nakagawa town of northern Hokkaido. The largest earthquake with MJMA4.3 occurred on 16 July 2012. We carried out temporal seismic observation with seven stations from 18 July 2012 to the last October 2012. Hypocenters were calculated using the Double-Difference hypocenter determination procedure with a local one dimensional P-wave velocity structure. Precise hypocenter data indicated that epicenters were distributed in very narrow area of 2 km×2 km with shallow depth from 4 km to 7 km. Earthquakes after middle of August occurred only in southern part of the region and depth had got shallower with time. Hypocenters indicated no clear alignment in consistent with any nodal planes of major earthquakes. An independent hypocenter cluster with shallower than 2 km was observed above the main activity area. A slow slip event (SSE) with Mw 5.4 coincidentally detected by GNSS crustal deformation data during the swarm. This swarm was situated at the southeastern end of the fault of SSE. This fact suggested that seismic swarm might triggered SSE or was induced by SSE.北海道大学大学院理学研究院Departmental Bulletin Paperapplication/pdfhttp://hdl.handle.net/2115/58248info:doi/10.14943/gbhu.78.37https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/58248/1/GBHU_78_p37-.pdf0439-3503AN0008976X北海道大学地球物理学研究報告7837512015-03-19jpnpublisher