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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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An SEM-DSM three-dimensional hybrid method for modelling.pdf | 5.02 MB | Adobe PDF | View/Open |
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