title: Characteristics of strong ground motions in the 2014Ms6.5 Ludian earthquake, Yunnan, China.
abstract: The 2014Ms6.5 (Mw6.1) Ludian earthquake occurred in the eastern Sichuan-Yunnan border region of western China. This earthquake caused much more severe engineering damage than the usual earthquakes with the same magnitude in China. The National Strong Motion Network obtained large set of ground motion recordings during the earthquake. To investigate the engineering interested characteristics of ground motion from Ludian earthquake and compare it with theMw7.9 Wenchuan and theMw6.6 Lushan earthquakes in western China, studies on the ground motion field, attenuation relationship, distance dependence of significant duration, and site amplification were carried out. Some conclusion is drawn. Specifically, the ground motion field reveals a directional feature, and the distribution characteristics of the two horizontal components are similar. The attenuation relationship for Ludian earthquake is basically consistent with the ground motion prediction equation (GMPE) for western China, except the slight smaller than the GMPE predicted at short periods. The distance dependences of ground motion duration are different in Sichuan and Yunnan regions due to the local physical dispersion andQvalue. The site amplification factors are dominated by linear site response for lower reference ground motion, but the nonlinearity becomes notable for higher reference ground motion. This feature is basically consistent with the empirical model for western China. All the results indicate that the spatial distribution of ground motion, the attenuation characteristics, and the site amplification effect should be considered in characterization of near-field ground motion.
authors.affiliation: Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Harbin, 150080 China.
authors.forename: J J
authors.initials: JJ
authors.lastname: Hu
authors.affiliation: Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Harbin, 150080 China.
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Harbin, 150080 China.
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Harbin, 150080 China ; Harbin Institute of Technology, Harbin, 150080 China.
authors.forename: L L
authors.initials: LL
authors.lastname: Xie
authors.affiliation: Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Harbin, 150080 China.
authors.forename: B F
authors.initials: BF
authors.lastname: Zhou
keywords: Attenuation relationship; Ground motion; Ludian earthquake; Significant duration; Site amplification