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  王宏伟,徐培彬,温瑞智,任叶飞.2015年4月25日尼泊尔廓尔喀MS8.1级地震强地面运动[J].震灾防御技术,2015,10(2):201-210, DOI:10.11899/zzfy20150201.

2015年4月25日尼泊尔廓尔喀MS8.1级地震强地面运动
摘要:    2015年4月25日尼泊尔廓尔喀地区发生MS8.1级地震,本文分析了加德满都强震台站的强地震动记录特征,其水平向地震动表现为明显的脉冲地震动,脉冲周期约为6.0s,反映了近场地震动的方向性效应;处于深厚沉积层上的加德满都谷地对地震动有一定的放大作用,且主震的场地峰值频率向低频段偏移,出现明显的场地非线性反应;采用随机有限断层方法模拟的空间地震动分布与宏观地震烈度图符合较好,可以为分析宏观震害提供参考;通过与尼泊尔设计反应谱对比,得出在短周期与长周期段,加德满都台站的水平向地震动的反应谱远高于设计反应谱,说明即使严格按照尼泊尔建筑抗震规范设计施工的建筑结构也难以抵御此次地震的破坏。
作者单位
王宏伟 中国地震局工程力学研究所哈尔滨 150080 
徐培彬 中国地震局工程力学研究所哈尔滨 150080 
温瑞智 中国地震局工程力学研究所哈尔滨 150080 
任叶飞 中国地震局工程力学研究所哈尔滨 150080 
关  键  词:廓尔喀地震  强地震动  速度脉冲  非线性反应  设计反应谱
DOI:10.11899/zzfy20150201
基金项目:地震行业专项(201508005);黑龙江省科学基金项目(LC2015022);国家科技与支撑计划课题(2014BAK03B01)
收稿日期:2015-05-21
作者简介:王宏伟,男,生于1990年。博士研究生。主要从事工程地震及强地震动特征研究。E-mail: whw1990413@163.com
通讯作者:温瑞智,男,生于1968年。研究员。主要从事工程地震、强震观测及地震动特征、场地地震反应等的研究。E-mail: ruizhi@iem.ac.cn
Strong Motions of Gorkha MS8.1 Earthquake on April 25, 2015
Abstract:      An earthquake of MS8.1 hit the Gorkha district, Nepal, on April 25, 2015. We analyzed the characteristics of the typical observed strong-ground motions. The horizontal components of the strong-ground motion at the KATNP strong-motion station had the significant pulse-like velocity with the period approximately 5.0s-6.0s, which could be attributed to the source rupture propagation directivity. The Kathmandu Valley, located in a basin of a river delta and lake sediment, could also amplified the ground motion. KATNP strong motions in the mainshock showed strong nonlinear site response. The simulated ground-motion field based on the stochastic finite-fault method was very consistent to the macro-seismic intensity maps released by China Earthquake Administration, which could serve the earthquake damage evaluation. The 5% damping-ratio spectral acceleration of the KATNP station exceeded the Nepal design spectrum in both short and long periods. It means that even buildings well designed and constructed strictly following the Nepal Nation Building Code could hardly resist this destructive earthquake.
Keywords:  The Gorkha earthquake  Strong motions  Pulse-like velocity  Nonlinear response  Design spectrum
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