著者
後藤 和彦
出版者
公益社団法人 日本地震学会
雑誌
地震 第2輯 (ISSN:00371114)
巻号頁・発行日
vol.65, no.3, pp.231-242, 2013-01-31 (Released:2013-07-19)
参考文献数
28
被引用文献数
7 9

The hypocenter of the 1911 great earthquake occurred around Kikai-jima, Japan is thought to be 28.0°N, 130.0°E (about 30km southward from Kikai-jima) and 100km depth in general. This implies that the 1911 event occurred within the subducting slab at the Ryukyu trench. However, it is not clearly known what kind of seismic data were used to determine the epicenter and how the depth of hypocenter was estimated quantitatively. In the present study, we determine hypocenter of this event by using selected S-P time data not only reported ones but also re-measured ones from smoked-paper seismograms. The hypocenter is revealed to be 28.7°N, 130.6°E and 60km in depth, about 60km northeastward from Kikai-jima. The focal depth is, however, considered to be about 10km instead of 60km by referring to the present hypocenter distribution because of the low reliability of focal depth in the relocation. Recent epicenter distribution shows the low seismic activity area on the plate boundary northeast off Kikai-jima which extends about 70km length parallel to the Ryukyu trench axis. The 1911 great earthquake seems to be occurred at the shallower rim of this low seismic activity area. If the low seismic activity is the result of strong coupling on plate boundary, this area might be the asperity of the 1911 great earthquake. Tsunami heights accompanied with this event are reported recently to be more than 5m at Kikai-jima and Amami-oshima, which supports the present study that the 1911 great earthquake is the interplate event rather than the intraslab one.

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(重要そうな論文?あとで読む)1911 年に喜界島近海で発生した 巨大地震の震源位置の再評価 https://t.co/GhPPk4TBlm
今日は、1911年喜界島近海の地震 (M8.0) から110年。リンク先は2012年の後藤さんの論文「1911年に喜界島近海で発生した巨大地震の震源位置の再評価」。 https://t.co/bwsqiZWHVU
後藤さんの論文→J-STAGE Articles - 1911年に喜界島近海で発生した巨大地震の震源位置の再評価 https://t.co/bwsqiZWHVU
この地震、遠方でも有感になっているので大きいようだがM8.0で良いのかは前から疑問に思っている 後藤 1911年に喜界島近海で発生した巨大地震の震源位置の再評価 https://t.co/v8lUeQC64s https://t.co/qD7hW9Tf18

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編集者: Gofukuji
2020-03-17 04:34:34 の編集で削除されたか、リンク先が変更された可能性があります。

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