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"path": ["53", "5997"], "permalink_uri": "http://hdl.handle.net/10232/00031553", "pubdate": {"attribute_name": "公開日", "attribute_value": "2021-01-26"}, "publish_date": "2021-01-26", "publish_status": "0", "recid": "15665", "relation": {}, "relation_version_is_last": true, "title": ["2017年の臨時地震観測による鹿児島湾・喜入沖の震源分布と発震機構 : 鹿児島地溝形成に伴う断層に沿った顕著な地震活動"], "weko_shared_id": -1}
  1. 掲載誌一覧
  2. 鹿児島大学理学部紀要
  3. vol.53
  1. 理学部
  2. 理学部・紀要論文

2017年の臨時地震観測による鹿児島湾・喜入沖の震源分布と発震機構 : 鹿児島地溝形成に伴う断層に沿った顕著な地震活動

http://hdl.handle.net/10232/00031553
http://hdl.handle.net/10232/00031553
984968fc-ba31-4993-8adc-a117bbdd18cd
名前 / ファイル ライセンス アクション
AA11246904_v53_p32-44.pdf AA11246904_v53_p32-44 (13.2 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2021-01-26
タイトル
タイトル 2017年の臨時地震観測による鹿児島湾・喜入沖の震源分布と発震機構 : 鹿児島地溝形成に伴う断層に沿った顕著な地震活動
タイトル
タイトル言語 en
タイトル Hypocenter distribution and focal mechanism of earthquakes off the coast of Kiire, Kagoshima Bay obtained from seismic observation in 2017 : Remarkable seismic activity along the faults that associated with the formation of Kagoshima Rift
タイトルよみ
タイトルよみ 2017ネン ノ リンジ ジシン カンソク ニヨル カゴシマワン キイレオキ ノ シンゲン ブンプ ト ハッシン キコウ : カゴシマ チコウ ケイセイ ニ トモナウ ダンソウ ニ ソッタ ケンチョナ ジシン カツドウ
著者 平野, 舟一郎

× 平野, 舟一郎

WEKO 138420

平野, 舟一郎

Search repository
八木原, 寛

× 八木原, 寛

WEKO 138421

八木原, 寛

Search repository
仲谷, 幸浩

× 仲谷, 幸浩

WEKO 138422

仲谷, 幸浩

Search repository
後藤, 和彦

× 後藤, 和彦

WEKO 138423

後藤, 和彦

Search repository
著者よみ
姓名 ヒラノ, シュウイチロウ
著者よみ
姓名 ヤキワラ, ヒロシ
著者よみ
姓名 ナカタニ, ユキヒロ
著者よみ
姓名 ゴトウ, カズヒコ
別言語の著者
姓名 HIRANO, Shuichiro
別言語の著者
姓名 YAKIWARA, Hiroshi
別言語の著者
姓名 NAKATANI, Yukihiro
別言語の著者
姓名 GOTO, Kazuhiko
言語
言語 jpn
キーワード
主題言語 en
主題Scheme Other
主題 Kagoshima Rift
キーワード
主題言語 en
主題Scheme Other
主題 The M5.3 earthquake in Kagoshima bay
キーワード
主題言語 en
主題Scheme Other
主題 Temporary seismic observation
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ departmental bulletin paper
要約(Abstract)
内容記述タイプ Other
内容記述 On July 11, 2017, a magnitude (M) 5.3 earthquake occurred off the coast of Kiire, Kagoshima which was the largest crustal earthquake in and around Kagoshima Bay in the last 100 years. Kagoshima Bay is included in Kagoshima Rift as formed by normal faults in its both eastern and western margins. The structure and tectonic process of the rift have been considered to relate with the seismic phenomena in this region. Because major calderas and active volcanoes, such as Sakurajima, also locate within Kagoshima Bay, local tectonics behind geophysical activity is quite complicated. Therefore, to investigate the detailed hypocenter distribution and focal mechanism of the remarkable M5-class event and its sequence is essential for understanding the crustal background stress and faulting process.
Since 2005, Nansei-Toko Observatory for Earthquakes and Volcanoes (NOEV), Kagoshima University have installed five onshore offline seismic stations around Kagoshima Bay, which consist of 2-Hz velocity sensors and data loggers. The M5.3 earthquake (hereafter, the mainshock) occurred in the immediate the vicinity of the last installed station which had just started observation from March, 2017. We merged both five offline and eight realtime seismic station data from 03/29/2017 to 12/31/2017 and then finally determined 776 hypocenters before and after the mainshock. Location method of this study is based on manual picking of arrival times of P- and S-phases and the event list is obtained from NOEV routine earthquake catalog. In order to minimize travel time residuals in the hypocenter determination, the station correction terms are applied to the procedure. Out of the final 776 events, we obtained the focal mechanisms for the mainshock and 157 aftershocks in the period 07/11/2017 to 09/30/2017 using P-wave first-motion polarities.
For the period before the mainshock, NOEV catalog data show that seismicity off Kiire region have started to be active from 11/20/2015. The beginning of the active phase might be associated with the static stress change triggered by the M7.1 earthquake off the west of Satsuma Peninsula on 11/14/2015. In a series of the preceding active episodes of seismicity, the mainshock occurred in July, 2017. For the period including the mainshock-aftershock sequence, the final hypocenter distribution of this study clearly indicates that most aftershocks are located along two separate east-dipping planes aligned parallel to each other in the east-west direction. Both seismic planes have a horizontal distance of approximately 1.7 km and dip angles of 53°. Because the up-dip extensions of the two seismic planes correspond to the respective topographic features of Kagoshima Rift, both seismic planes can be explained as the faults formed by Kagoshima Rift. On the other hand, approximately 90% of the focal mechanisms for the mainshock and aftershocks determined by this study show strike-slip faulting with a NW-SE tension axis, which is not the faulting type expected from the east-dipping fault planes but are in good agreement with the direction of principal stress estimated from shallow crustal earthquakes in southern Kyushu. Focusing on the day of the mainshock, the subsequent aftershocks distributed nearly vertical at depths of about 9–11 km that corresponds to the dip angle (86°) of the assumed fault plane of the mainshock. After two weeks from the mainshock, the aftershock areas gradually expanded in the up-dip directions along both fault planes with the dip angles of 53°. This aftershock migration might be caused by supply of fluids from the deep crust to the faults as preferential flow paths. In conclusion, the occurrences of the mainshock and the subsequent aftershocks are constrained by the regional stress field and the migration of the crustal fluids along the faults formed by rifting process of Kagoshima Rift, respectively.
収録雑誌名 鹿児島大学理学部紀要
en : Reports of the Faculty of Science, Kagoshima University

巻 53, p. 32-44, 発行日 2020-12-31
ISSN
収録物識別子タイプ ISSN
ISSN 13456938
NII書誌ID(雑誌)
収録物識別子タイプ NCID
NC ID AA11246904
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
NDC
主題Scheme NDC
主題 450
公開者・出版者
出版者 鹿児島大学
公開者よみ
公開者よみ カゴシマ ダイガク
公開者別名
公開者別名 Kagoshima University
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