期刊
GEOPHYSICAL JOURNAL INTERNATIONAL
卷 197, 期 2, 页码 1166-1183出版社
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggu050
关键词
Body waves; Computational seismology; Wave propagation
资金
- NSF [EAR-1053064]
- CSEDI at Caltech [EAR-1161046]
- USC [EAR-0809023]
- Directorate For Geosciences
- Division Of Earth Sciences [1053064, 1161046] Funding Source: National Science Foundation
Two-dimensional (2-D) finite-difference (FD) synthetics, which fill the gap between fast 1-D analytic synthetics and time-consuming full 3-D synthetics in our ability to model seismograms, have been used in many studies. We address several issues involving 2-D FD methods in generating global synthetic seismograms. These include: (1) interfacing point source excitation for earthquakes with 2-D FD methods; (2) out-of-plane spreading corrections and (3) reducing the spherical Earth to the flattened models. The first issue is tackled using two methods, a 'transparent source box' approach and a moment tensor excitation approach, where each has its own advantages. Moreover, our 'source box' excitation does not have the late-time drift problem that occurred in previous studies. The out-of-plane geometric spreading correction is accounted for by estimating the ray parameter and applying a post-simulation filter to 2-D synthetics. Finally, parameters of the Earth-flattening transformation are discussed and validated. The effectiveness of this method is demonstrated by comparing our synthetics with frequency-wavenumber summation, normal-mode and 3-D spectral-element synthetics.
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