Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
권호 표지

Stochastic prediction of ground motions in southern Korea

전정구;조남대;백창업

  • Published : 20020000
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Abstract

Strong ground motions in southern Korea were simulated using the stochastic method based on the Brune-source and finite fault models. Input parameters such as Brune stress drop (Ds) and attenuation parameter κ were newly estimated using the recent seismic data of years 1999 and 2000 in southern Korea. The average Brune stress drop and the attenuation parameter κ were estimated to be 65-bar and 0.00516+0.000147R, respectively, where R is the hypocenter distance in km unit. These values are verified by simulation of ground motions based on the stochastic method for the 06/02/1999 Gyeongju earthquake. With use of the parameters, strong ground motions in southern Korea were simulated for earthquakes of moment magnitude 5 to 8 using the stochastic method. Both the Brune source model and the finite-fault source model give similar results of simulations for moderate-sized earth-quakes. However, the difference between the results from these two models becomes larger for larger earthquake magnitudes or for smaller hypocenter distances. Results for the finite-fault model show azimuthal variations of ground motions around the fault.

Keywords

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