Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/83639
Title: An SEM-DSM three-dimensional hybrid method for modelling teleseismic waves with complicated source-side structures
Authors: Wu, Wenbo
Ni, Sidao
Zhan, Zhongwen
Wei, Shengji
Keywords: DRNTU::Science::Geology
Wave Propagation
Body Waves
Issue Date: 2018
Source: Wu, W., Ni, S., Zhan, Z., & Wei, S. (2018). An SEM-DSM three-dimensional hybrid method for modelling teleseismic waves with complicated source-side structures. Geophysical Journal International, 215(1), 133-154. doi:10.1093/gji/ggy273
Series/Report no.: Geophysical Journal International
Abstract: Despite recent advances in High Performance Computing (HPC), numerical simulation of high frequency (e.g. 1 Hz or higher) seismic wave propagation at the global scale is still prohibitive. To overcome this difficulty, we propose a hybrid method to efficiently compute teleseismic waveforms with 3-D source-side structures. By coupling the Spectral Element Method (SEM) with the Direct Solution Method (DSM) based on the representation theorem, we are able to limit the costly SEM simulation to a small source-side region and avoid computation over the entire space of the Earth. Our hybrid method is benchmarked against 1-D DSM synthetics and 3-D SEM synthetics. We also discuss numerical difficulties in the implementation, including slow DSM convergence near source depth, discretization error, Green’s function interpolation and local 3-D wavefield approximations. As a case study, we apply our hybrid method to two subduction earthquakes and show its advantage in understanding 3-D source-side effects on teleseismic P-waves. Our hybrid method reduces computational cost by more than two orders of magnitude when only source-side 3-D complexities are of concern. Thus our hybrid method is useful for a series of problems in seismology, such as imaging 3-D structures of a subducting slab or a mid-ocean ridge and studying source parameters with 3-D source-side complexities using teleseismic waveforms.
URI: https://hdl.handle.net/10356/83639
http://hdl.handle.net/10220/47597
DOI: 10.1093/gji/ggy273
Schools: Asian School of the Environment 
Research Centres: Earth Observatory of Singapore 
Rights: © 2018 The Author(s). All rights reserved. This paper was published in Geophysical Journal International and is made available with permission of The Author(s). The definitive version is available at www.blackwell-synergy.com.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ASE Journal Articles
EOS Journal Articles

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