Kappa (k) derived from accelerograms recorded in the 2008 Wenchuan mainshock,Sichuan, China |
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| Institution: | 1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China;2. Graduate University of the Chinese Academy of Sciences, 19A Yuquanlu, Beijing, 100049, China;1. Geophysical Lab, Department of Physics, Tezpur University, Tezpur 784028, Assam, India;2. Institute of the Earth''s crust SB RAS, 128 Lermontov Street, 664033 Irkutsk, Russia |
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| Abstract: | High-frequency spectral decay factor, kappa (k), in the accelerograms of the Wenchuan mainshock was measured using strong motion data from 52 stations within 311 km of the epicenter. The derived k range from 0.0034 s to 0.0468 s. The correlation of k versus fault distance was given, which is k = 0.01288 + 5.9068 × 10–5 R for the N-S component, k = 0.01881 + 1.4219 × 10–5 R for the E-W component, and k = 0.00855 + 5.6086 × 10–5 R for the U-D component. The analysis on the spatial variation of k demonstrates that k relates to source effect and propagation effect besides local site effect. Ground motions for the 52 stations were simulated using derived k and compared to actual recordings in terms of waveforms, amplitude spectra and response spectra. The results show agreement at shorter periods (<1 s), but a slight overestimation at longer periods (1–7 s). |
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| Keywords: | High-frequency spectral decay Kappa Stochastic simulation The Wenchuan mainshock |
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