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

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

研究成果: ジャーナルへの寄稿記事

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.[Figure not available: see fulltext.].

元の言語英語
記事番号67
ジャーナルearth, planets and space
71
発行部数1
DOI
出版物ステータス出版済み - 12 1 2019

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ground motion
earthquakes
stations
microtremor
earthquake
causes
strong motion
velocity structure
S waves
wave velocity
S-wave
shock
wave amplification
SH waves
SH-wave
phase velocity
velocity profile
aftershock
surface wave
surface waves

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

これを引用

Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 M w 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.

:: earth, planets and space, 巻 71, 番号 1, 67, 01.12.2019.

研究成果: ジャーナルへの寄稿記事

Takai, N, Shigefuji, M, Horita, J, Nomoto, S, Maeda, T, Ichiyanagi, M, Takahashi, H, Yamanaka, H, Chimoto, K, Tsuno, S, Korenaga, M & Yamada, N 2019, 'Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 M w 6.6 Hokkaido eastern Iburi earthquake', earth, planets and space, 巻. 71, 番号 1, 67. https://doi.org/10.1186/s40623-019-1044-4
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 M w 6.6 Hokkaido eastern Iburi earthquake. :: earth, planets and space. 2019 ; 巻 71, 番号 1.
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abstract = "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.[Figure not available: see fulltext.].",
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AU - Horita, Jun

AU - Nomoto, Shingo

AU - Maeda, Takahiro

AU - Ichiyanagi, Masayoshi

AU - Takahashi, Hiroaki

AU - Yamanaka, Hiroaki

AU - Chimoto, Kosuke

AU - Tsuno, Seiji

AU - Korenaga, Masahiro

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