Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake

Takai, Nobuo; Shigefuji, Michiko; Horita, Jun; Nomoto, Shingo; Maeda, Takahiro; Ichiyanagi, Masayoshi; Takahashi, Hiroaki; Yamanaka, Hiroaki; Chimoto, Kosuke; Tsuno, Seiji; Korenaga, Masahiro; Yamada, Nobuyuki

Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake

Takai, Nobuo; Shigefuji, Michiko; Horita, Jun et al.

Earth, Planets and Space, 2019, 71(1), 67

Permalink : https://hdl.handle.net/2115/74684

このアイテムのアクセス数:914件（2026-08-20 02:16 集計）

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アクセス権	open access
URI	https://hdl.handle.net/2115/74684
タイトル	Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake
著者	Takai, Nobuo ; Shigefuji, Michiko ; Horita, Jun ; Nomoto, Shingo ; Maeda, Takahiro ; Ichiyanagi, Masayoshi ; Takahashi, Hiroaki ; Yamanaka, Hiroaki ; Chimoto, Kosuke ; Tsuno, Seiji ; Korenaga, Masahiro ; Yamada, Nobuyuki
e-Rad_Researcher 10281792 著者名 Takai, Nobuo
著者名 Shigefuji, Michiko
著者名 Horita, Jun
著者名 Nomoto, Shingo
著者名 Maeda, Takahiro
著者名 Ichiyanagi, Masayoshi
著者名 Takahashi, Hiroaki
著者名 Yamanaka, Hiroaki
著者名 Chimoto, Kosuke
著者名 Tsuno, Seiji
著者名 Korenaga, Masahiro
著者名 Yamada, Nobuyuki
言語	英語
キーワード	The 2018 Hokkaido eastern Iburi earthquake
	Strong ground motion
	Velocity structure
	Temporary strong motion observation
	Microtremor measurement
	Multichannel analysis of surface wave
	S-wave velocity
	Site amplification
発行日	2019
収録物名	Earth, Planets and Space
巻(号)	71(1)
ページ	67
抄録	We investigated the cause of destructive ground motion during the 2018 Hokkaido eastern Iburi earthquake. We conducted strong motion observations of aftershocks and microtremors and the surface wave method in the damaged areas of the town of Mukawa, Hokkaido prefecture, Japan. The ground accelerations were continuously recorded during a period of approximately 3 months after the main shock on September 6, 2018. The heavily damaged buildings were mainly situated around the strong motion station (HKD126) in Mukawa town. Such concentration of damage can be explained by the strong power that was observed in the 1–2 s period of the response spectrum at this station. We estimated the S-wave velocity profiles of this station site and a temporary station site that was installed on a nearby hill. The estimated S-wave velocity, which was inverted from phase velocity structures with the microtremor array and the surface wave method observations explained the difference in the SH-wave amplification characteristics between the two sites. An analysis of HKD126 and the temporarily observed records clearly indicates the strong effects of the local geological conditions on the heavily damaged area of Mukawa. The strong ground motion power generated during the main shock in Mukawa for 1–2 s period was mainly amplified by this shallow underground velocity structure.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
PISSN	1880-5981
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1186/s40623-019-1044-4