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Bulletin of the Seismological Society of America; October 2004; v. 94; no. 5; p. 1690-1705; DOI: 10.1785/012004016
© 2004 Seismological Society of America
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Article

An Efficient Finite-Difference Method for Simulating 3D Seismic Response of Localized Basin Structures

Tae-Seob Kang and Chang-Eob Baag

School of Earth and Environmental Sciences (BK21)
Seoul National University, NS80
San 56-1, Sillim-dong, Gwanak-gu
Seoul 151-747, Korea
tskang{at}seismic.snu.ac.kr
baagce{at}snu.ac.kr

Manuscript received 19 February 2004.

We present an efficient technique to simulate seismic wave propagation in structures including basins using localized discontinuous grids in combination with locally variable timesteps. The technique uses a 3D fourth-order, staggered-grid, finite-difference method based on the velocity-stress formulations of the elastodynamic equations. Discontinuous grids have 3D blocky form; thus, the boundary between the two adjacent regions of different grid spacings could be extended to the position of the Earth's free surface. As an example of application, ground motions in a small-scale basin in the Hongseong area, Korea, is simulated considering a hypothetical source of the 7 October 1978 Hongseong, ML 5, earthquake. The results show that the method can achieve distinguished reductions of computational memory and thus CPU time for models of the localized 3D structures compared with methods on grids with constant spatial and temporal steps.




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T. Yang and Y. Shen
Frequency-Dependent Crustal Correction for Finite-Frequency Seismic Tomography
Bulletin of the Seismological Society of America, December 1, 2006; 96(6): 2441 - 2448.
[Abstract] [Full Text] [PDF]


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