Geometrical dependence on the stress and slip tendency acting on the subduction megathrust of the Nankai seismogenic zone off Kumano
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- Material Type
- 記事
- Author/Editor
- Masataka KinoshitaKazuya ShiraishiEvi Demetriou
- Publication, Distribution, etc.
- Publication Date
- 2019-01-23
- Publication Date (W3CDTF)
- 2019-01-23
- Periodical title
- Progress in earth and planetary science
- No. or year of volume/issue
- 6(7)
- Volume
- 6(7)
- ISSN (Periodical Title)
- 2197-4284
- ISSN-L (Periodical Title)
- 2197-4284
- Text Language Code
- eng
- DOI
- 10.1186/s40645-018-0253-y
- Persistent ID (NDL)
- info:ndljp/pid/11249495
- Collection
- Collection (Materials For Handicapped People:1)
- Collection (particular)
- 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他
- Acquisition Basis
- オンライン資料収集制度
- Date Accepted (W3CDTF)
- 2019-03-05T23:10:26+09:00
- Date Captured (W3CDTF)
- 2019-03-05
- Format (IMT)
- application/pdf
- Access Restrictions
- 国立国会図書館内限定公開
- Service for the Digitized Contents Transmission Service
- 図書館・個人送信対象外
- Availability of remote photoduplication service
- 可
- Periodical Title (URI)
- Periodical Title (Persistent ID (NDL))
- info:ndljp/pid/11249488
- Data Provider (Database)
- 国立国会図書館 : 国立国会図書館デジタルコレクション
- Summary, etc.
- We assess the dependence of megathrust geometry near the updip edge of the Nankai seismogenic zone according to the slip tendency of the megathrust based on a reprocessed 3D PSDM seismic volume image and International Ocean Discovery Program (IODP) NanTroSEIZE drilling data off the coast of the Kii Peninsula, central Japan. The plate boundary fault surface is manually picked from the 3D seismic volume and is divided into three groups: low dip (10°–15°) trending NW to N in the NE region, intermediate dip (~ 25°) trending north in the western region, and high dip (30°–40°) trending NW in the SE corner. We then calculate the overburden (Sv) by converting the modeled 3D velocity to bulk density. Here, Sv ranges from 100 MPa near the SW edge to 160 MPa on the NE corner. In order to derive horizontal principal stresses (SH and Sh) and the pore fluid pressure (Pp), we assign the ratio of horizontal-to-vertical principal stresses, r (= SH/Sv), and the ratio of pore fluid pressure-to-vertical stress, λ (= Pp/Sv) based on IODP drilling data. The directions of SH and the slip on the fault are set parallel to the plate convergence vector (N55W). Assuming a triaxial condition (SH > Sh = Sv), the slip tendency (Ts) can be calculated from the dip angle and dip azimuth of the fault surface, r, and λ. We found that Ts is sensitive to the variation in fault geometry. For r = 1.2 and λ = 0.7 (normalized pore pressure ratio λ* = 0.25), Ts is low (~ 0.1) in the low-angle dip region and higher (> 0.2) in the high-angle dip region. This suggests that the high-angle fault is optimally oriented under this condition. Low Ts in the low-angle dip region would correspond to a weaker region due to a low frictional strength, assuming that the fault surface should slip simultaneously. Using the high pore pressure ratio (λ* ~ 0.85) beneath the fault zone, the fault beneath IODP Site C0002 is very close to failure if r > 1.2.
- DOI
- 10.1186/s40645-018-0253-y
- Access Restrictions
- インターネット公開
- Rights (production)
- © The Author(s). 2019.This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
- Related Material
- Additional file 1: of Geometrical dependence on the stress and slip tendency acting on the subduction megathrust of the Nankai seismogenic zone off Kumano
- Related Material (URI)
- Is Referenced By
- Seismogenic Zone Structures Revealed by Improved 3‐D Seismic Images in the Nankai Trough off KumanoHigh-spatial-resolution slip tendency modeling based on 3D seismic data to assess induced earthquake potential and identify suitable CO2 storage sites
- References
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- References (URI)
- Data Provider (Database)
- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- 学術機関リポジトリデータベース雑誌記事索引データベースCrossrefCiNii Articles科学研究費助成事業データベース科学研究費助成事業データベース科学研究費助成事業データベース科学研究費助成事業データベース科学研究費助成事業データベースCrossrefCrossref
- Bibliographic ID (NDL)
- 11249495
- NAID
- 120007149007