Hu J J, Zhang Q, Jiang Z J, Xie L L, Zhou B F
Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, 29 Xuefu Road, Harbin, 150080 China.
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.
J Seismol. 2016;20(1):361-373. doi: 10.1007/s10950-015-9532-x. Epub 2015 Oct 24.
The 2014 6.5 (6.1) 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 the 7.9 Wenchuan and the 6.6 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 and value. 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.
2014年6.5（6.1）级鲁甸地震发生在中国西部川滇边境地区东部。此次地震造成的工程破坏比中国境内同等震级的常见地震严重得多。国家强震动台网在地震期间获取了大量地面运动记录。为研究鲁甸地震地面运动的工程感兴趣特征，并将其与中国西部的7.9级汶川地震和6.6级芦山地震进行比较，开展了对地面运动场、衰减关系、卓越持续时间的距离依赖性以及场地放大效应的研究。得出了一些结论。具体而言，地面运动场呈现出方向性特征，两个水平分量的分布特征相似。鲁甸地震的衰减关系与中国西部的地面运动预测方程（GMPE）基本一致，只是在短周期时略小于GMPE预测值。由于局部物理频散和 值，四川和云南地区地面运动持续时间的距离依赖性有所不同。对于较低的参考地面运动，场地放大因子以线性场地响应为主，但对于较高的参考地面运动，非线性变得显著。这一特征与中国西部的经验模型基本一致。所有结果表明，在近场地面运动特征描述中应考虑地面运动的空间分布、衰减特性和场地放大效应。
