地震研究

对2016年日本熊本MW7.0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。

The strong motion records obtained by the Japan K-net and Kik-net strong motion network during the 2016 MW 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.

引言
1 幅值特征
2 持时特征
3 频谱特征
4 结论

图1 熊本地震获取记录台站分布图<br/>Fig.1 The station distribution map of the Kumamoto earthquake

图1 熊本地震获取记录台站分布图
Fig.1 The station distribution map of the Kumamoto earthquake

图2 KMMH16(a)与KMMH03(b)台站记录的加速度时程曲线<br/>Fig.2 The accerlergram of stations of KMMH16(a)and KMMH03(b)

图2 KMMH16(a)与KMMH03(b)台站记录的加速度时程曲线
Fig.2 The accerlergram of stations of KMMH16(a)and KMMH03(b)

图3 校正峰值加速度(a)与校正峰值速度(b)分布图<br/>Fig.3 Corrected peak ground acceleration(a)and peak ground velocity(b)distribution map

图3 校正峰值加速度(a)与校正峰值速度(b)分布图
Fig.3 Corrected peak ground acceleration(a)and peak ground velocity(b)distribution map

图4 按照中国仪器地震烈度标准(a)及日本气象厅仪器地震烈度标准(b)得到熊本地震仪器地震列度分布图<br/>Fig.4 Instrumental seismic ientensiy map of China seismic intensity scale(a)andJapan seismic intensity scale(b)

图4 按照中国仪器地震烈度标准(a)及日本气象厅仪器地震烈度标准(b)得到熊本地震仪器地震列度分布图
Fig.4 Instrumental seismic ientensiy map of China seismic intensity scale(a)andJapan seismic intensity scale(b)

图5 观测PGA(a)和PGV(b)与对应衰减关系的比较<br/>Fig.5 Comparison of the observed horizontal PGA(a)and PGV data(b) with related attenuation relathionship

图5 观测PGA(a)和PGV(b)与对应衰减关系的比较
Fig.5 Comparison of the observed horizontal PGA(a)and PGV data(b) with related attenuation relathionship

图6 5%-95%(a)与5%-75%(b)能量持时分布图<br/>Fig.6 The 5%-95%(a)and 5%-75%(b)significant duration distribution map

图6 5%-95%(a)与5%-75%(b)能量持时分布图
Fig.6 The 5%-95%(a)and 5%-75%(b)significant duration distribution map

图7 水平向观测数据5%-95%(a)和5%-75%(b)能量持时与相应衰减关系的比较<br/>Fig.7 Comparison of the observed 5%-95%(a)and 5%-75%(b)horizontal significant duration with related attenuation relathionship

图7 水平向观测数据5%-95%(a)和5%-75%(b)能量持时与相应衰减关系的比较
Fig.7 Comparison of the observed 5%-95%(a)and 5%-75%(b)horizontal significant duration with related attenuation relathionship

图8 熊本地震中KMMH16(a),KMMH03(b)台站记录加速度反应谱与阪神地震中<br/>JR Takatori台站记录的加速度反应谱对比图<br/>Fig.8 Comparison of acceleration response spectra between KMMH16(a), KMMH03(b)with JR Takatori stations

图8 熊本地震中KMMH16(a),KMMH03(b)台站记录加速度反应谱与阪神地震中
JR Takatori台站记录的加速度反应谱对比图
Fig.8 Comparison of acceleration response spectra between KMMH16(a), KMMH03(b)with JR Takatori stations

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备注

引言

1 幅值特征

2 持时特征

3 频谱特征

4 结论

期刊信息