Ground Motion Prediction Equation for Lanzhou Region from Small Earthquake Records

Zheng Ru Tao; Wen Qian Li; Xia Xin Tao

doi:10.4028/www.scientific.net/AMR.838-841.1480

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 838-841Ground Motion Prediction Equation for Lanzhou...

Ground Motion Prediction Equation for Lanzhou Region from Small Earthquake Records

Abstract:

By small earthquake records from the Gansu broadband digital earthquake network, five regional source and crustal medium parameters, stress drop Δσ, quality factor parameters Q₀ and η, geometrical spreading parameters R₁ and R₂, are inversed for the Lanzhou area. Envelops of Fourier spectra are adopted as the objective function, the values of those parameters are 34.625bars, 95.665, 0.360, 58.188km and 105.650km, respectively. These values are adopted to calculate Fourier amplitude spectra, and complex spectra are formed by combining with random phase spectra. Acceleration time histories can be simulated, and PGAs on different moment magnitude-distance pairs are obtained previously. Compared with several observed strong ground motion data, the result is lower in the case of M_w=5.0, passes through the data in the case of M_w=6.0 and higher than the record of M_w=7.0. It is adopted in regional seismic zonation. Compared with The Zonation Map of Earthquake Ground Motion Parameters in China (GB18306-2001), the result is close to the map when PGA is lower than 0.2g.

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Periodical:

Advanced Materials Research (Volumes 838-841)

Pages:

1480-1483

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.838-841.1480

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Online since:

November 2013

Authors:

Zheng Ru Tao, Wen Qian Li, Xia Xin Tao

Keywords:

Ground Motion Prediction, Inverse, Micro-Genetic Algorithm, Regional Parameters, Small Earthquake Records

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