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Title:: The Characteristics of Strong Motion Records of the Kumamoto M_W7.0 Earthquake Occurred on Apr.16,2016

作者:: 解全才¹; 马强¹; 张景发²; (1.中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨 150080; 2.中国地震局地壳应力研究所中国地震局地壳动力学重点实验室,北京 100085)

Author(s):: XIE Quancai¹; MA Qiang¹; ZHANG Jingfa²; (1.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China)(2.Key Laboratory of Crustal Dynamics,Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China)

Keywords:: Kumamoto earthquake; peak ground acceleration; peak ground velocity; significant duration; response spectrum

摘要:: 对2016年日本熊本M_W7.0地震K-net和Kik-net强震动台网获取的强震动记录进行校正处理,分析了峰值加速度与峰值速度幅值特征,将观测结果与日本常用的3组衰减关系进行了对比,最后分析了强震动记录的持时特征和频谱特征。结果表明:①本次地震EW,NS及UD向最大峰值加速度分别为1 156.95 gal,-786.60 gal, 874.40 gal,与日本地区峰值加速度和峰值速度衰减公式预测值比较吻合; ②5%-75%和5%-95%的2种能量持时整体上符合随距离增大而增大的规律; ③KMMH16台站3个方向的加速度反应谱在0.5～1.2 s都超过1995年阪神地震中JR Takaroti台站的反应谱,本次地震对木结构房屋和低矮及中层钢筋混凝土房屋破坏严重。

Abstract:: The strong motion records obtained by the Japan K-net and Kik-net strong motion network during the 2016 M_W 7.0 Kumamoto earthquake were collected and processed. The characteristics of peak ground acceleration(PGA)and peak ground velocity(PGV)were analyzed. Then,the observation results were compared with three attenuation relationship formulas commonly used in Japan. Finally,the characteristics of significant duration and of frequency spectrum were analyzed. The results show that:(1)The PGA of EW,NS,UD component is 1 156.95 gal,-786.60 gal,874.40 gal,respectively. The observed PGA and PGV consistent well with the PGA and PGV attenuation formulas commonly used in Japan.(2)The 5% ～ 75% significant duration and 5% ～ 95% significant duration were calculated,the significant duration grow with the epicenter distance in the whole.(3)The acceleration response spectrum of KMMH16 station exceeded those obtained by the JR Takatori station trigged during the 1995 Kobe earthquake in the 0.5～1.2 s period range. It will cause server damage to wooden houses and low to mid-rise reinforced concrete buildings.