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  1. 131 地震研究所
  2. 東京大学地震研究所彙報
  3. 81
  4. 3-4
  1. 0 資料タイプ別
  2. 30 紀要・部局刊行物
  3. 東京大学地震研究所彙報
  4. 81
  5. 3-4

Deep Seismic Surveys in the Kinki District : Shingu-Maizuru Line

https://doi.org/10.15083/0000032497
887ec98d-c3ed-4fa4-b006-a1bad6e18331
名前 / ファイル ライセンス アクション
IHO81306.pdf IHO81306.pdf (5.1MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2016-12-28
タイトル
タイトル Deep Seismic Surveys in the Kinki District : Shingu-Maizuru Line
言語 en
言語
言語 eng
キーワード
主題 seismic velocity structure
主題Scheme Other
キーワード
主題 controlled source seismology
主題Scheme Other
キーワード
主題 active fault
主題Scheme Other
キーワード
主題 Philippine Sea plate
主題Scheme Other
キーワード
主題 strong motion evaluation
主題Scheme Other
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.15083/0000032497
ID登録タイプ JaLC
その他のタイトル
その他のタイトル 近畿地方における地震探査 : 新宮―舞鶴測線
著者 Ito, Kiyoshi

× Ito, Kiyoshi

WEKO 124690

Ito, Kiyoshi

Search repository
Umeda, Yasuhiro

× Umeda, Yasuhiro

WEKO 124691

Umeda, Yasuhiro

Search repository
Sato, Hiroshi

× Sato, Hiroshi

WEKO 124692

Sato, Hiroshi

Search repository
Hirose, Issei

× Hirose, Issei

WEKO 124693

Hirose, Issei

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Hirata, Naoshi

× Hirata, Naoshi

WEKO 124694

Hirata, Naoshi

Search repository
Kawanaka, Taku

× Kawanaka, Taku

WEKO 124695

Kawanaka, Taku

Search repository
Ikawa, Takeshi

× Ikawa, Takeshi

WEKO 124696

Ikawa, Takeshi

Search repository
著者別名
識別子
識別子 124697
識別子Scheme WEKO
姓名
姓名 伊藤, 潔
著者別名
識別子
識別子 124698
識別子Scheme WEKO
姓名
姓名 梅田, 康弘
著者別名
識別子
識別子 124699
識別子Scheme WEKO
姓名
姓名 佐藤, 比呂志
著者別名
識別子
識別子 124700
識別子Scheme WEKO
姓名
姓名 廣瀬, 一聖
著者別名
識別子
識別子 124701
識別子Scheme WEKO
姓名
姓名 平田, 直
著者別名
識別子
識別子 124702
識別子Scheme WEKO
姓名
姓名 川中, 卓
著者別名
識別子
識別子 124703
識別子Scheme WEKO
姓名
姓名 井川, 猛
著者所属
著者所属 Disaster Prevention Research Institute, Kyoto University
著者所属
著者所属 Earthquake Research Institute, University of Tokyo
著者所属
著者所属 JGI, Inc
抄録
内容記述タイプ Abstract
内容記述 Seismic surveys of the crust and the upper mantle structure have been conducted under the Special Project for Earthquake Disaster Mitigation in Urban Areas (DAIDAITOKU). In 2004 deep seismic surveys were carried out in the Kinki district southwest Japan. Seismic refraction and wide-angle-reflection surveys were carried out along the Shingu-Maizuru line, which crosses Honshu Island from the Pacific side to the Japan Sea side nearly coincident with the direction of the subduction of the Philippine Sea plate (PHS). In the profile, 13 shots (100-100 kg) of dynamite and 3 multi-sweeps (a few hundreds of sweeps) with 4 vibroseis trucks were used as sources of the surveys. More than 2300 observation sites were set at intervals of 50-100m all along the line. Clear first arrivals and reflections from PHS and from reflectors in the crust were obtained at almost all the stations. In particular, waves from dynamite were well recorded at all stations. As for the stacked data of multisweeps, waves can be recorded in the offset range of 30-40km from the source. The multi-vibration method is particularly useful for the surveys in the urban areas, where dynamite cannot be used as a source. The reflections from PHS are very clear beneath Kii Peninsula and are still visible under the northern Kinki district at depth of about 50-10 km, where no earthquakes occur. The reflectors seem to indicate aseismic slab in the northern Kinki district. A clear two parallel reflectors dipping towards north associated with PHS are seen beneath Kii Peninsula. The lower reflector is coincident with the upper boundary of earthquake distribution in the mantle, which has been considered as the plate boundary. The boundary seems to be the oceanic Moho. The upper reflector is determined to be about 1-10km shallower than the lower one and this is the plate boundary of the subducting plate. The layer between the two reflectors is thought to be the oceanic crust subducting in the mantle. Low frequency earthquakes and5or tremors occur at 30-40km deep in the upper reflector, which is less distinct at the low frequency events. In the inland area, many clear reflections were obtained at depth of about 15 and 25 km. These reflectors decline towards north, which seem to relate with the large active faults. The reflector at depth of about 15km is well corresponded to the base of the seismogenic zone in the crust and seems to play an important role to the nucleation process of large inland earthquakes. Another reflector at depth of about 25km may possibly be the impermeable layer, which may cause pre seismic slip for large inland earthquakes.
書誌情報 東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo

巻 81, 号 3-4, p. 239-245, 発行日 2006
ISSN
収録物識別子タイプ ISSN
収録物識別子 00408972
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00162258
フォーマット
内容記述タイプ Other
内容記述 application/pdf
日本十進分類法
主題 51.1
主題Scheme NDC
出版者
出版者 東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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