Abstract
AbstractA preliminary source model composed of asperities for the 2004 Mid Niigata Prefecture, Japan, earthquake (MJMA=6.8) was estimated by the empirical Green’s function method. The source parameters for two asperities located on the fault plane were determined from the comparisons of the synthesized broad-band ground motions with the observed ones at several stations including near source. Furthermore, we performed the preliminary nonlinear analysis of the sedimentary soils to reproduce the observed ground motions at NIG019 of K-NET. Resultantly, we pointed out the need of more asperity in northern part on the fault plane and the importance of the quantitative analysis of the nonlinearity of the sedimentary soils at K-NET stations.
Highlights
On 23th October 2004, the Mid Niigata Prefecture, Japan, earthquake (MJMA=6.8) struck the Chuetsu district in Niigata Prefecture, and caused the heavy damages since the 1995 Hyogo-ken Nanbu earthquake
Separate contributions of Asp-1 and Asp-2 at NIG021 shown in Fig. 5 show a need to reproduce the large acceleration recording
This result might suggest the existence of more asperity located in northern part on the fault plane
Summary
On 23th October 2004, the Mid Niigata Prefecture, Japan, earthquake (MJMA=6.8) struck the Chuetsu district in Niigata Prefecture, and caused the heavy damages since the 1995 Hyogo-ken Nanbu earthquake. This paper provides a preliminary source model for the 2004 Mid Niigata Prefecture earthquake estimated by the empirical Green’s function method (Irikura, 1986) The advantage of this method is that it includes the propagation path and local site effects and estimates basically broad-band ground motions as long as the aftershock recordings are accurate enough in broad-frequency band. We assume that ground motions are generated from two asperities, each of which has a uniform stress drop with a finite extent on the fault plane and obeys an ω−2 spectral scaling Their locations are basically determined referring to the inverted slip models, e.g., by Honda et al (2005). This procedure is the same as Kamae and Irikura (1998) and Kamae and Kawabe (2004)
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