Bulletin des sciences géographiques de l'INCT
Volume 21, Numéro 1, Pages 19-26
2017-10-31
2d Elastic Finite Element Method (fem) For Deformation Analysis Of The Seismic And Post-seismic Cheliff (algeria) Geodetic Network
Authors : Gourine B .
Abstract
The region of Cheliff , located at the North West of Algeria, is of an exceptional interest for the study of crustal motion due to seismic activity. However, it is classical to represent the correspondent deformations according to displacement vectors and strain tensors. Through this present work, we propose a solution based on the finite element method (FEM) to refine the estimation and the representation of the geodetic networks deformation. In this context, a study of the deformation is carried out to analyze the horizontal motion of the Cheliff geodetic network due to the famous earthquake of October 10, 1980 (Ms = 7.3), based on two-dimensional elastic finite element model. The network was observed by classical triangulation in 1976 (by INCT) and 1981 (by CRAAG). The different results are illustrated in terms of displacement vectors, strain and stress tensors. Estimated deformation is interpreted according to previous geophysical studies which revealed a compressive phenomenon of Cheliff area, in the NNW-SSE orientation, due to the rapprochement of the African and Eurasian tectonic plates, and a block rotation phenomenon, at the SE and NW parts of the fault, in a retrograde direction. The study was extended to the post-seismic geodetic network observed between June1990 and April 1992. This network, established by distance measurements, is composed of 12 monitoring points distributed along the reverse fault. The results show a post seismic meaningful deformation, in the fault central segment, characterized by global NW-SE direction of strain tensors in agrees with ground data.
Keywords
Deformation, Finite element method, Strain Tensor, Stress tensor, Geodetic Network
Les articles similaires
بوسالم أحلام
.
عابد يوسف
.
ص 117-132.
Yahia Zeghoudi
.
pages 74-88.
Boukhlef Djedjiga
.
Boughrara Dalila
.
Mohellebi Hassane
.
pages 267-277.
Salman Movahedi N.
.
Aminnejad B.
.
pages 1206-1220.
Gourine B
.
pages 139-160.
