2024-03-29T15:39:10Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02003854
2022-10-31T01:45:38Z
1642837622505:1642837957109:1642837981907
1642838403551:1642838406414
FE modeling of contemporary tectonic stress in the India-Eurasia collision zone
Chamlagain, Deepak
Hayashi, Daigoro
林, 大五郎
An understanding of orientation of contemporary maximum horizontal compressive stress (σ_<Hmax>) is important to many aspects of earth sciences, e.g. seismicity, neotectonics, and plate driving mechanisms. Comparison of recent stress observations and the results of stress modeling provide a powerful approach to refine our understanding of geodynamics processes. This is especially important for complex area like Himalayan-Tibet orogen, a continental\ncollision zone between the Indian and Eurasian Plates. The frequently occurring earthquakes\nand other tectonic stress indicator have provided vast set of database on maximum\nhorizontal compressive stress (σ_<Hmax>) that can be useful to study contemporary stress\nsources, plate kinematics and ongoing geodynamics. In this contribution, taking advantage of elastic plane stress finite element modeling (FEM), and observed data on σ_<Hmax>, several models are presented to reproduce stress field. Simulated models show that the convergence normal to the orogen is essential to reproduce observed σ_<Hmax>, which in turn controls the magnitude and orientation of σ_<Hmax>. The kinematics equivalent to east-west tectonic escape did not reproduce the observed stress field. Therefore, the best-fit model of present day stress field is obtained only in three domains model with southeastward tectonic escape of\nthe Tibetan crust rather than eastward extrusion. There is, however, significant increase in σ_<Hmax> magnitude with increasing crustal depth because of stress amplification.\nIncorporation of suture zones in the model did not change orientation of σ_<Hmax>, significantly.\nConsidering these facts, 'continuum tectonic model' is more preferable than the 'block\ntectonic model' for the active deformation of the Tibetan Plateau. Contemporary stress field\ndeduced from several tectonic stress markers reconciles with the predicted one giving\ninsights on their sources and ongoing plate kinematics of the continental collision zone\nbetween Indian and Eurasian Plates.
紀要論文
http://purl.org/coar/resource_type/c_6501
琉球大学理学部
2008-03
VoR
http://hdl.handle.net/20.500.12000/5609
0286-9640
AN00250774
琉球大学理学部紀要
Bulletin of the College of Science. University of the Ryukyus
85
79
39
eng
open access