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  1. 防災科研関係論文

北茨城-いわき地域における稠密アレイで記録された地殻内S波反射波イメージング

https://nied-repo.bosai.go.jp/records/3883
https://nied-repo.bosai.go.jp/records/3883
498d3ca0-880d-49a4-9845-5db2a1c5d9e5
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 ja
タイトル 北茨城-いわき地域における稠密アレイで記録された地殻内S波反射波イメージング
タイトル
言語 en
タイトル Imaging of S Wave Reflection Boundaries in the Crust Obtained from a Dense Seismic Array at the Northern Part of Ibaraki and Iwaki Area
言語
言語 jpn
著者 臼田 優太

× 臼田 優太

ja 臼田 優太

en USUDA Yuta

Search repository
飯高 隆

× 飯高 隆

ja 飯高 隆

en IIDAKA Takashi

Search repository
蔵下 英司

× 蔵下 英司

ja 蔵下 英司

en KURASHIMO Eiji

Search repository
五十嵐 俊博

× 五十嵐 俊博

ja 五十嵐 俊博

en IGARASHI Toshihiro

Search repository
小原 一成

× 小原 一成

ja 小原 一成

en OBARA Kazushige

Search repository
加藤 愛太郎

× 加藤 愛太郎

ja 加藤 愛太郎

en KATO Aitaro

Search repository
酒井 慎一

× 酒井 慎一

ja 酒井 慎一

en SAKAI Shinichi

Search repository
中川 茂樹

× 中川 茂樹

ja 中川 茂樹

en NAKAGAWA Shigeki

Search repository
武田 哲也

× 武田 哲也

ja 武田 哲也

en TAKEDA Tetsuya

Search repository
抄録
内容記述タイプ Other
内容記述 The Tohoku-Oki earthquake (M<sub>w</sub> 9.0) occurred off the Pacific coast of Japan, on March 11, 2011. The seismic activity in Japan changed after the Tohoku-Oki earthquake. Especially around the border between Ibaraki and Fukushima prefectures, so many earthquakes within the crust have occurred. The largest earthquake in this region is the Fukushima Hamadori earthquake (M<sub>w</sub> 6.6) on April 11, 2011, which caused severe damage. In this region, the seismic activity had been very low before the Tohoku-Oki earthquake, but the seismic activity became significantly active after the Tohoku-Oki earthquake. There are few previous studies about this region that investigated the crustal structure in detail because the seismic activity was low before the Tohoku-Oki earthquake. Thus, to investigate the crustal structure in this region is very important from the perspective of elucidating the mechanism of large inland earthquakes such as the Fukushima Hamadori earthquake. Earthquake Research Institute, The University of Tokyo, and other organizations deployed a temporary dense seismic array in this region after the Fukushima Hamadori earthquake. We examined the waveforms obtained from the seismic array and found two reflected S waves from the deep part of crust. We estimated the locations of the reflection points in the deep part of the crust by applying Reverse VSP (Vertical Seismic Profile) method which has been used for seismic exploration. As a result, we found two S wave reflection boundaries at depths of (1) 15~23 km and (2) 26~34 km in the crust. The reflection boundary (2) was found to be the Moho discontinuity by comparing with previous studies in this region. It can be interpreted that the reflection boundary (1) indicates the upper boundary of the layer with crustal fluids in terms of the large amplitudes of the reflected S waves. We compared the locations of the reflection boundary (1) with seismicity in this region and found that the location of the reflection boundary (1) was consistent with that of the Fukushima Hamadori earthquake and the focal area at the depth of 15~20 km which was one of the characteristics of seismic activity in the region. Thus, the crustal fluids may be related to the seismic activity in the region triggered after the Tohoku-Oki earthquake.
言語 en
書誌情報 ja : 地震 第2輯
en : Zisin (Journal of the Seismological Society of Japan. 2nd ser.)

巻 75, p. 125-143, 発行日 2022-11-02
出版者
言語 ja
出版者 公益社団法人 日本地震学会
出版者
言語 en
出版者 SEISMOLOGICAL SOCIETY OF JAPAN
ISSN
収録物識別子タイプ EISSN
収録物識別子 1883-9029
DOI
関連識別子 10.4294/zisin.2021-13
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