Results:
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By Arwen Vidal 3 , Lucy Calvillo 1 , Werner Horn 1 , Carol Shubin 1 , Gerry Simila 2 1 Department of Mathematics, California State University Northridge 2 Department of Geology, California State University Northridge 3 Department of Geological Sciences, University of Colorado Boulder Results: Conclusions: The two programs were compared with the GPS readings. The results from DISLOC give a better approximation to the GPS readings with less error. Future Work: In order to improve the results and reduce error a better algorithm needs to be designed.In addition,we would like to consider non-homogenous models, such models would better approximate the true variation in the upper crustal level. Acknowledgements: This work was supported by NASA MURED PAIR Program Grant Number: NASA-NCC5-489 Abstract: The Northridge earthquake occurred on January 17, 1994 with a magnitude of 6.7. There were aftershocks that followed with a magnitude ranging from 4.0 to 5.2. This earthquake was caused by a blind thrust fault, since the fault did not rupture the surface. The purpose of this project is to determine the location of blind fault that caused the 1994 Northridge earthquake. In order to determine its location, two linear elastic system solvers are used; these solvers are MATLAB PDE Toolbox and DISLOC. Results from the solvers are compared with the real Global Positioning Satellite (GPS) readings and differences between the solutions are discussed. Introduction: MATLAB PDE Toolbox computes solutions to an elastic system with Dirichlet boundary conditions on the sides and bottom and with Neumann boundary conditions on the surface of a rectangular domain. Jet Propulsion Laboratory (JPL) DISLOC software computes a solution for an elastic half- space model with Neumann boundary conditions. In each case, a crack, or internal boundary condition was inserted in the domain. The depth and length of the crack were given, while the DETERMINING THE LOCATION OF THE NORTHRIDGE BLIND FAULT V ert.Displacm entvs.position -5 0 5 10 15 20 25 30 35 40 45 -30 -20 -10 0 10 20 30 position displacm ent given uz(44) uz(45)Disloc uz(46) GPS Data DISLOC Graph M atlab Approx. 0 50 100 150 200 250 300 350 400 450 -20 -15 -10 -5 0 5 10 15 20 position displaceme given phi =40,slip=1.25m phi=40,slip = 1 phi=42,slip = 1 MATLAB Graph
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DETERMINING THE LOCATION OF THE NORTHRIDGE BLIND FAULT. - PowerPoint PPT Presentation
Transcript of Results:
By Arwen Vidal3, Lucy Calvillo1, Werner Horn1, Carol Shubin1, Gerry Simila2
1Department of Mathematics, California State University Northridge2Department of Geology, California State University Northridge
3Department of Geological Sciences, University of Colorado Boulder
Results:
Conclusions:
The two programs were compared with the GPS readings. The results from DISLOC give a better approximation to the GPS readings with less error.
Future Work:
In order to improve the results and reduce error a better algorithm needs to be designed.In addition,we would like to consider non-homogenous models, such models would better approximate the true variation in the upper crustal level.
Acknowledgements:This work was supported by NASA MURED PAIR ProgramGrant Number: NASA-NCC5-489
Abstract:
The Northridge earthquake occurred on January 17, 1994 with a magnitude of 6.7. There were aftershocks that followed with a magnitude ranging from 4.0 to 5.2. This earthquake was caused by a blind thrust fault, since the fault did not rupture the surface.The purpose of this project is to determine the location of blind fault that caused the 1994 Northridge earthquake. In order to determine its location, two linear elastic system solvers are used; these solvers are MATLAB PDE Toolbox and DISLOC. Results from the solvers are compared with the real Global Positioning Satellite (GPS) readings and differences between the solutions are discussed.
Introduction:
MATLAB PDE Toolbox computes solutions to an elastic system with Dirichlet boundary conditions on the sides and bottom and with Neumann boundary conditions on the surface of a rectangular domain. Jet Propulsion Laboratory (JPL) DISLOC software computes a solution for an elastic half- space model with Neumann boundary conditions. In each case, a crack, or internal boundary condition was inserted in the domain. The depth and length of the crack were given, while the angle of inclination and the slip (or deformation) on the crack were varied.
DETERMINING THE LOCATION OF THE NORTHRIDGE BLIND FAULT
Vert. Displacment vs. position
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