A Suggestion on Uncertainty Correction of Ground Motion Attenuation in Probabilistic Seismic Hazard Assessment

Abstract:

The uncertainty of ground motion attenuation and its correction in PSHA is deal with in this paper. Mean values and standard deviations of random errors of three attenuation relationships of NGA-west1 are analyzed statistically from the data base released by the project. The dependences of the mean and deviation on magnitude, distance and peak ground acceleration are checked by the data base. The fact of mean values varying with acceleration is revealed obviously. Ground motion parameter Y is adopted into the probability density function of random error in a form of subsection. Finally, a suggestion to improve the correction is presented as subsection correction in the paper. The result of a case study by suggested procedure shows that the corrected acceleration is slightly higher than that of the traditional correction at the start of hazard curve, and is significantly lower than that of the traditional correction at the end of the curve, if the mean of random error decreases with acceleration.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 1662-1666
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.1662
• Online since: July 2014
• Authors: Chuan Fang Wang, Xia Xin Tao*, Anastasia Z, Kai Zhao, Wei Jiang
• Keywords: Attenuation, Ground Motion, PSHA, Uncertainty Correction

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