An improved method for near-fault strong ground motion records&rsquo; baseline correction

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (5) : 137-142.

An improved method for near-fault strong ground motion records’ baseline correction

ZHANG Bin, YU Yanxiang, XIAO Liang

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Abstract

Based on the principle of Iwan et al.’ two-stage correction method, the parameter of time shift slope ratio ki was introduced to determine starting time of strong seismic stage offset t1, and the maximum flatness of corrected displacement f was introduced to determine starting time of ending stage offset t2.The parameter of root mean square deviation RMSD was introduced to choose order number of fitted function at the end of displacement, and the improved method of baseline correction for near-fault strong ground motion records was proposed.Then this improved method was used to do baseline correction for strong seismic motion records of 8 near-fault stations of Wenchuan earthquake and Lushan one to get permanent displacements.The results showed that permanent displacements obtained agree well with the same seismic displacements measured at GPS stations close to near-fault ones, ratios of permanent displacements to GPS measured results are within the range of 0.57-1.72 and the average value is 0.99, the uncertainty brought by subjective experience to baseline correction results can be reduced to a certain extent.Meanwhile, effects of 7 baseline correction methods on peak ground motion parameters and permanent displacements were analyzed contrastively.It was shown that effects of different baseline correction methods on PGA and PGV are smaller, while those on PGD and permanent displacements are much larger.

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near-fault strong ground motion records / baseline correction / permanent displacement / GPS

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ZHANG Bin, YU Yanxiang, XIAO Liang. An improved method for near-fault strong ground motion records’ baseline correction[J]. Journal of Vibration and Shock, 2020, 39(5): 137-142

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