Departmental Bulletin Paper 2016年6月16日に発生した函館市南茅部付近の地震(MJMA 5.3)と余震活動
Seismic activity associated with the 2016 Minamikayabe earthquake (MJMA5.3)in southern Hokkaido, Japan

一柳, 昌義  ,  高田, 真秀  ,  高橋, 浩晃

80pp.1 - 11 , 2017-03-19 , 北海道大学大学院理学研究院
A M5.3 shallow earthquake occurred on 16 June 2016 in Minamikayabe region, southern Hokkaido. Three temporal seismic stations had been operated in the focal region from 18 June 2016 to 29 August 2016. Initial hypocenters and 1-D P-wave velocity structure were estimated from waveform data of temporal and permanent seismic stations. Fine aftershock distribution inferred from the double-difference procedure showed that the hypocenters were distributed in NW-SE direction, which might be agree with a fault plane of mainshock focal mechanism. Five foreshocks occurred near mainshock hypocenter showed similar waveform with high correlation. Characteristic persistent background seismicity and latest middle size earthquake might be related to high geothermal gradient in this region.

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