CaltechAUTHORS
  A Caltech Library Service

Dynamic earthquake rupture modelled with an unstructured 3-D spectral element method applied to the 2011 M9 Tohoku earthquake

Galvez, P. and Ampuero, J.-P. and Dalguer, L. A. and Somala, S. N. and Nissen-Meyer, T. (2014) Dynamic earthquake rupture modelled with an unstructured 3-D spectral element method applied to the 2011 M9 Tohoku earthquake. Geophysical Journal International, 198 (2). pp. 1222-1240. ISSN 0956-540X. https://resolver.caltech.edu/CaltechAUTHORS:20140828-085041886

[img]
Preview
PDF - Published Version
See Usage Policy.

8Mb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20140828-085041886

Abstract

An important goal of computational seismology is to simulate dynamic earthquake rupture and strong ground motion in realistic models that include crustal heterogeneities and complex fault geometries. To accomplish this, we incorporate dynamic rupture modelling capabilities in a spectral element solver on unstructured meshes, the 3-D open source code SPECFEM3D, and employ state-of-the-art software for the generation of unstructured meshes of hexahedral elements. These tools provide high flexibility in representing fault systems with complex geometries, including faults with branches and non-planar faults. The domain size is extended with progressive mesh coarsening to maintain an accurate resolution of the static field. Our implementation of dynamic rupture does not affect the parallel scalability of the code. We verify our implementation by comparing our results to those of two finite element codes on benchmark problems including branched faults. Finally, we present a preliminary dynamic rupture model of the 2011 M_w 9.0 Tohoku earthquake including a non-planar plate interface with heterogeneous frictional properties and initial stresses. Our simulation reproduces qualitatively the depth-dependent frequency content of the source and the large slip close to the trench observed for this earthquake.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/gji/ggu203DOIArticle
http://gji.oxfordjournals.org/content/198/2/1222PublisherArticle
ORCID:
AuthorORCID
Ampuero, J.-P.0000-0002-4827-7987
Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2014 May 28. Received 2014 May 26; in original form 2013 December 5. This study was supported by the QUEST project (Quantitative Estimation of Earth’s Seismic Sources and Structure) funded by the 7th Framework Programm of the European Commission, the ASCETE Project (Advanced Simulation of Coupled Earthquake and Tsunami Events) funded by the Volkswagen Foundation within the program ‘New Conceptual Approaches to Modeling and Simulation of Complex Systems’, by the US National Science Foundation (CAREER award EAR-1151926) and by the Southern California Earthquake Center (based on NSF Cooperative Agreement EAR-0529922 and USGS Cooperative Agreement 07HQAC0026). Simulations were done at the Swiss National Supercomputing Center (CSCS), under the production projects ‘Development of Dynamic Rupture Models to Study the Physics of Earthquakes and Near-Source Ground Motion’ and ‘Development of a Database of Physics-Based Synthetic Earthquakes for Ground Motion Prediction’. We thank Yihe Huang for discussions on observations and modelling of the Tohoku earthquake and for sharing her results of a 2-D convergence test.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
European Commission 7th Framework ProgrammUNSPECIFIED
Volkswagen FoundationUNSPECIFIED
NSFEAR-1151926
NSFEAR-0529922
USGS07HQAC0026
Southern California Earthquake Center (SCEC)UNSPECIFIED
Subject Keywords:Earthquake dynamics; Computational seismology
Issue or Number:2
Record Number:CaltechAUTHORS:20140828-085041886
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140828-085041886
Official Citation:Galvez, P., Ampuero, J.-P., Dalguer, L. A., Somala, S. N., & Nissen-Meyer, T. (2014). Dynamic earthquake rupture modelled with an unstructured 3-D spectral element method applied to the 2011 M9 Tohoku earthquake. Geophysical Journal International, 198(2), 1222-1240. doi: 10.1093/gji/ggu203
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49014
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:28 Aug 2014 18:17
Last Modified:03 Oct 2019 07:09

Repository Staff Only: item control page