Gamra : simple meshing for complex earthquakes

The static offsets caused by earthquakes are well described by elastostatic models with a discontinuity in the displacement along the fault. A traditional approach to model this discontinuity is to align the numerical mesh with the fault and solve the equations using finite elements. However, this d...

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Main Authors: Landry, Walter, Barbot, Sylvain
Other Authors: Earth Observatory of Singapore
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/105359
http://hdl.handle.net/10220/49516
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1053592020-09-26T21:25:32Z Gamra : simple meshing for complex earthquakes Landry, Walter Barbot, Sylvain Earth Observatory of Singapore Science::Geology Immersed Interface Method Earthquakes The static offsets caused by earthquakes are well described by elastostatic models with a discontinuity in the displacement along the fault. A traditional approach to model this discontinuity is to align the numerical mesh with the fault and solve the equations using finite elements. However, this distorted mesh can be difficult to generate and update. We present a new numerical method, inspired by the Immersed Interface Method (Leveque and Li, 1994), for solving the elastostatic equations with embedded discontinuities. This method has been carefully designed so that it can be used on parallel machines on an adapted finite difference grid. We have implemented this method in Gamra, a new code for earth modeling. We demonstrate the correctness of the method with analytic tests, and we demonstrate its practical performance by solving a realistic earthquake model to extremely high precision. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2019-08-02T03:43:33Z 2019-12-06T21:49:54Z 2019-08-02T03:43:33Z 2019-12-06T21:49:54Z 2016 Journal Article Landry, W., & Barbot, S. (2016). Gamra: Simple meshing for complex earthquakes. Computers & Geosciences, 90, 49-63. doi:10.1016/j.cageo.2016.02.014 0098-3004 https://hdl.handle.net/10356/105359 http://hdl.handle.net/10220/49516 10.1016/j.cageo.2016.02.014 en Computers & Geosciences © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). 15 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Science::Geology
Immersed Interface Method
Earthquakes
spellingShingle Science::Geology
Immersed Interface Method
Earthquakes
Landry, Walter
Barbot, Sylvain
Gamra : simple meshing for complex earthquakes
description The static offsets caused by earthquakes are well described by elastostatic models with a discontinuity in the displacement along the fault. A traditional approach to model this discontinuity is to align the numerical mesh with the fault and solve the equations using finite elements. However, this distorted mesh can be difficult to generate and update. We present a new numerical method, inspired by the Immersed Interface Method (Leveque and Li, 1994), for solving the elastostatic equations with embedded discontinuities. This method has been carefully designed so that it can be used on parallel machines on an adapted finite difference grid. We have implemented this method in Gamra, a new code for earth modeling. We demonstrate the correctness of the method with analytic tests, and we demonstrate its practical performance by solving a realistic earthquake model to extremely high precision.
author2 Earth Observatory of Singapore
author_facet Earth Observatory of Singapore
Landry, Walter
Barbot, Sylvain
format Article
author Landry, Walter
Barbot, Sylvain
author_sort Landry, Walter
title Gamra : simple meshing for complex earthquakes
title_short Gamra : simple meshing for complex earthquakes
title_full Gamra : simple meshing for complex earthquakes
title_fullStr Gamra : simple meshing for complex earthquakes
title_full_unstemmed Gamra : simple meshing for complex earthquakes
title_sort gamra : simple meshing for complex earthquakes
publishDate 2019
url https://hdl.handle.net/10356/105359
http://hdl.handle.net/10220/49516
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