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• W2085645309 abstract "The seismicity in the Tamba region, northeast of the Hyogo‐ken Nanbu earthquake in Japan (January 17, 1995; M JMA 7.2), increased significantly following this earthquake. This increase suggests that the static stress change due to a large earthquake causes a change in the crustal condition or dynamics. In order to reveal the changes quantitatively, we investigate the temporal variation in coda Q −l and b value in the Tamba region. We analyze the waveform data of many shallow microearthquakes ( M 1.5–3.0) in the region recorded in a period from 1987 to 1996. Coda Q −1 is estimated in 10 frequency bands in a range of 1.5–24 Hz based on the single isotropic scattering model. At frequencies between 1.5 and 4.0 Hz the temporal variation in coda Q −1 shows significant correlation with the occurrence of the Hyogo‐ken Nanbu earthquake; coda Q −l increases after the event. A variation in b value whose sign is opposite to that of coda Q −1 is recognized. The fracture dimensions of microearthquakes that contribute to the variation in b value are estimated to be 400 m. This scale length is consistent with the characteristic scale length of scatterer, 300–600 m, which contributes effectively to a temporal variation in coda Q −1 . The crustal activity in the Tamba region is possibly controlled by the heterogeneity with dominant scale of 10 2 m. The stress sensitivity of the coda Q −1 change is estimated to be 10 (MPa) −1 . This value is an order of magnitude larger than the stress sensitivity of seismic velocity reported before." @default.
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• W2085645309 date "2000-03-10" @default.
• W2085645309 modified "2023-10-16" @default.
• W2085645309 title "Temporal changes in coda <i>Q</i>⁻¹ and <i>b</i> value due to the static stress change associated with the 1995 Hyogo‐ken Nanbu earthquake" @default.
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• W2085645309 doi "https://doi.org/10.1029/1999jb900432" @default.
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