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  1. 紀要論文
  2. 琉球大学理学部紀要
  3. 87号
  1. 部局別インデックス
  2. 理学部

FE modeling of present day tectonic stress along the San Andreas Fault zone

http://hdl.handle.net/20.500.12000/9529
http://hdl.handle.net/20.500.12000/9529
fcdd699a-e91f-472c-81c9-0dd800b71da8
名前 / ファイル ライセンス アクション
No87p021.pdf No87p021.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2009-04-06
タイトル
タイトル FE modeling of present day tectonic stress along the San Andreas Fault zone
言語 en
作成者 Koirala, Matrika Prasad

× Koirala, Matrika Prasad

en Koirala, Matrika Prasad

Hauashi, Daigoro

× Hauashi, Daigoro

en Hauashi, Daigoro

林, 大五郎

× 林, 大五郎

ja 林, 大五郎

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
内容記述
内容記述タイプ Other
内容記述 F E modeling under plane stress condition is used to analyze the state of stress in and around the San Andreas Fault (SAF) System taking whole area of California. In this study we mainly focus on the state of stress at the general seismogenic depth of 12 km, imposing elastic rheology. The purpose of the present study is to simulate the regional stress field, displacement vectors and failures. Stress perturbation due to major fault, its geometry and major branches are analyzed. Depthwise variation from 20 km to 0.5 km is considered for the fault type analysis. Series of calculations are performed with \nthe parametrical variations of domain properties and are applied for the strong/weak SAF. All the simulated results are finally utilized for the implication of present day plate kinematics. Although in nature there is lateral and vertical variation in rheology within single domain and different domains (not considered in this study), our simulated results are comparable with the observed data. The imposed boundary condition (fixed North American plate, Pacific plate motion along N34°W vector up to northern terminus of the San Andreas faults and N50°E vector motion for the subducting Gorda and Juan de Fuca plates) had simulated the present day regional σHmax orientation and displacement vector. Simulated results show some local effect on the stress field and displacement vector by the main strand of the fault and probably its geometry and branch (Garlock Fault). Probably the low angle σHmax orientation to the strike of the SAF system in the South California (although there are some high angle σHmax orientation in southeastern California) compare to the central and northern California is due to the big bend and the Garlock Fault. This modeling had also beautifully simulated the left lateral strike slip movement on the Garlock Fault. Failure analysis performed based on Byerlee's law directly test the strong SAF and variation of physical parameters in the Mohr-Coulomb failure criterion is utilized to test relatively strong/weak SAF. Our simulated results (like stress, displacement vector, and failures) in the weak fault in relatively strong crust conditions has more or less reproduced comparable and theoretically correct results, allowed us to favor weak fault in relatively strong crust. Depthwise variation of the fault type reveal that as the depth increases, the fault types are generally normal and shallow depth gives more strike slip and thrust fault. In conclusion SAF may terminate as a normal fault at the depth.
内容記述タイプ Other
内容記述 紀要論文
出版者
言語 ja
出版者 琉球大学理学部
言語
言語 eng
資源タイプ
資源タイプ departmental bulletin paper
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/9529
識別子タイプ HDL
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0286-9640
収録物識別子タイプ NCID
収録物識別子 AN00250774
収録物名
言語 ja
収録物名 琉球大学理学部紀要
書誌情報
号 87, p. 21-45
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