Item type |
デフォルトアイテムタイプ(フル)(1) |
公開日 |
2007-12-10 |
タイトル |
|
|
タイトル |
Stress Distribution and Fault Development Around Nepal Himalaya by Means of Finite Element Method |
|
言語 |
en |
作成者 |
Alam, Md. Mahmudul
Hayashi, Daigoro
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 |
There are a number of methods to analyse geological structures. Finite element method is one of them. Numerical modeling based on finite element analysis is an effective tool for studying the elastic behaviors of earth's crust due to tectonic movement. This study describes how to use an advanced numerical modeling technique, the finite element method, to compute rock deformation and to predict stress and fault development as a function of material properties, cohesion and friction angle. Stress distribution and fault development of 2 dimensional plane strain FEM models of four Himalayan cross sections are described. SW (south west) to NE (north east) horizontal shortening up to maximum 375 m (equivalent displacement at 7.5 cm/yr of 5000 yr) is applied at the southwestern end of the cross-sections. Proposed models show that the direction of maximum principal stresses (σ_1) are horizontal along the shallower part of all the models. Variation of the velocity boundary condition indicates the changes of direction of principal stresses along the deeper part while that along the shallower part remain unchanged.\nAccording to the Mohr - Coulomb criterion, failure is observed along the shallower part of Siwalik, Tethys and Granitic layer, and a very few near the surface of MBT, MCT and STDS. Failure has not occurred in the deeper part of Higher Himalaya and Lesser Himalaya, inspite of changing physical parameters of rock formations, because of the hydrostatic condition that is observed along the models. Previous studies on focal mechanism solutions of earthquakes in the Himalayan region provide the existence of thrust faults along its EW stretching with one plane dipping gently north beneath the Himalaya. Simulation shows the same distribution of thrust faults along the upper part of the models as shown by the focal mechanism solutions. |
内容記述 |
|
|
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/20.500.12000/2621 |
|
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 |
|
|
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 |
収録物名 |
|
|
言語 |
en |
|
収録物名 |
Bulletin of the College of Science. University of the Ryukyus |
書誌情報 |
号 73,
p. 15-54
|