| 2020年云南省巧家县M_S 5.0地震强震动记录初步分析 |
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| 引用本文： | 赵昆,林国良,杨黎薇,崔建文.2020年云南省巧家县M_S 5.0地震强震动记录初步分析[J].地震地磁观测与研究,2020,41(3):200-208. |
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| 作者姓名： | 赵昆 林国良 杨黎薇 崔建文 |
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| 作者单位： | 中国昆明 650224 云南省地震局 |
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| 基金项目： | 云南省地震局青年地震科学基金（项目编号：2019ZX02） |
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| 摘 要： | 2020年5月18日云南省巧家县发生M_S5.0地震,中国数字强震动台网的13个强震台站和昭通简易烈度计示范项目建设的43个烈度计台站,共接收168条强震动记录,经常规处理,绘制震区加速度峰值等值线图,并与云南地区常用地震动衰减关系进行对比,分析加速度峰值较大的几个台站频谱特性,计算地震动能量持时,讨论中小地震中高加速度峰值/低震害现象的成因,得到以下结论:(1) PGA等值线图形状较为平滑,其长轴呈NW—SE向展布;(2)云南地区常用地震动衰减关系预测值总体衰减趋势与观测值一致,但在近场(0—30 km)时,预测值基本偏小;(3)加速度峰值较大的几个台站记录主频集中在1—5 Hz;(4)小河镇台记录的能量持时较短,说明能量衰减较快,属脉冲型记录,不会对建筑物造成较大破坏。
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| 关 键 词： | 巧家MS 5.0地震 强震动记录 衰减关系 地震动持时 频谱 |
Strong motion record analysis of the Qiaojia MS 5.0 earthquake in Yunnan Province, 2020 |
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| ZHAO Kun,LIN Guoliang,YANG Liwei,CUI Jianwen.Strong motion record analysis of the Qiaojia MS 5.0 earthquake in Yunnan Province, 2020[J].Seismological and Geomagnetic Observation and Research,2020,41(3):200-208. |
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| Authors: | ZHAO Kun LIN Guoliang YANG Liwei CUI Jianwen |
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| Institution: | Yunnan Earthquake Agency, Kunming 650224, China |
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| Abstract: | An MS 5.0 earthquake occurred in Qiaojia County of Yunnan Province on May 18, 2020. 13 strong-motion stations of the China Digital Strong Motion Network and 43 intensity stations built in the Simple Intensity Demonstration Project of Zhaotong collected 165 sets of records in the earthquake mainshock. First, the strong-motion records were preliminarily processed and the PGA contour lines were drawn. Then the commonly used attenuation relation of strong motion in Yunnan was compared with the observed data and the spectral characteristics of several stations with large peak accelerations were analyzed, the ground motion energy durations were calculated. Based on these analyses we get some conclusions:① The contour lines of PGA are smooth and their long axis spreads in the direction of northwest-southeast. ② The commonly used attenuation relationship of strong motion in Yunnan is consistent with observed data in general but smaller in the near field (0-30 km).③ The peak frequency of records at stations with large peak accelerations is concentrated in 1-5 Hz.④ The ground motion energy duration of the record at Xiaohe station is very short, indicating the energy decay is fast, so it will not cause great damage to buildings. |
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| Keywords: | Qiaojia MS 5 0 earthquake strong-motion records the attenuation relationship ground motion duration spectral characteristics |
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