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dc.contributor.authorWu, Wenboen
dc.contributor.authorNi, Sidaoen
dc.contributor.authorZhan, Zhongwenen
dc.contributor.authorWei, Shengjien
dc.identifier.citationWu, 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/ggy273en
dc.description.abstractDespite 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.en
dc.format.extent22 p.en
dc.relation.ispartofseriesGeophysical Journal Internationalen
dc.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
dc.subjectWave Propagationen
dc.subjectBody Wavesen
dc.titleAn SEM-DSM three-dimensional hybrid method for modelling teleseismic waves with complicated source-side structuresen
dc.typeJournal Articleen
dc.contributor.schoolAsian School of the Environmenten
dc.contributor.researchEarth Observatory of Singaporeen
dc.description.versionPublished versionen
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