地震研究

采用2016年青海门源6.4级地震震中周边64个台的加速度峰值和其中10个台的强震波形数据对地震动的衰减、反应谱及垂直分量与水平分量的比值进行了分析。研究结果表明:门源地震动衰减规律基本符合青藏区的地震动衰减关系变化规律,震中距300 km以内,水平向与垂直向地震动衰减速度相近,震中距大于300 km时,水平向比垂直向地震动衰减速度缓慢; 在200 km范围内,部分垂直向与南北向PGA比值偏大的台站基本上分布在托莱山断裂和冷龙岭断裂以北的地区。从加速度反应谱三分量的对比分析发现,土层场地与基岩场地相比呈现明显的场地放大效应; 反应谱比的凹槽现象说明在工程抗震中应重视垂直向地震动的作用。

Using the acceleration peaks of 64 stations and the strong earthquake waveform data of 10 stations in the area around the epicenter of Qinghai Menyuan MS6.4 earthquake,we analyzed the attenuation of ground motion,the acceleration response spectrum and the ratio of vertical component and horizontal component. The research results show as follows:the ground motion attenuation law of Menyuan earthquake basically accords with that in Tibetan area. When the epicenter distance is within 300 km,the attenuation speed of horizontal and vertical ground motions are close; when the epicenter distance is greater than 300 km,the attenuation speed of horizontal ground motion attenuation is slower than that of the vertical ground motion. When the epicenter distance is within 200 km,some stations with larger PGA ratio of UD/NS are basically distributed in the north area of Lenglongling Fault and Tuolaishan Fault. Compared analysis on the three-component of acceleration response spectrum,we find that compared with bedrock site,the soil layer site presents obvious site amplification effect. The groove phenomenon of response spectrum shows that the role of vertical ground motion should be paid attention to the engineering earthquake resistance.

引言
1 研究区构造背景及资料选取
2 地震动加速度峰值分析
3 加速度反应谱分析
4 结论

图1 门源6.4级地震及强震台站分布示意图<br/>Fig.1 The schematic map of the distribution of the epicenter of Menyuan MS6.4 earthquake and strong earthquake stations

图1 门源6.4级地震及强震台站分布示意图
Fig.1 The schematic map of the distribution of the epicenter of Menyuan MS6.4 earthquake and strong earthquake stations

图2 中国西部及青藏区地震动衰减关系与门源地震64个台站的记录对比<br/>Fig.2 Comparison of the ground motion attenuation relationship of west area and Tibetan area of China and the records of Menyuan MS6.4 earthquake

图2 中国西部及青藏区地震动衰减关系与门源地震64个台站的记录对比
Fig.2 Comparison of the ground motion attenuation relationship of west area and Tibetan area of China and the records of Menyuan MS6.4 earthquake

图3 64个台站地震动加速度峰值垂直向与水平向比值随震中距的变化<br/>Fig.3 The ratio of vertical and horizontal components of acceleration peak of ground motion recorded by 64 stations varied with epicenter distance

图3 64个台站地震动加速度峰值垂直向与水平向比值随震中距的变化
Fig.3 The ratio of vertical and horizontal components of acceleration peak of ground motion recorded by 64 stations varied with epicenter distance

图4 10个台站水平向与垂直向反应谱(a)EW向;(b)NS向;(c)UD向<br/>Fig.4 The response spectrum of horizontal and vertical components of Menyuan MS6.4 earthquake recorded by 10 stations

图4 10个台站水平向与垂直向反应谱(a)EW向;(b)NS向;(c)UD向
Fig.4 The response spectrum of horizontal and vertical components of Menyuan MS6.4 earthquake recorded by 10 stations

图5 门源气象局台(a)和青石嘴台(b)的反应谱<br/>Fig.5 The response spectrum of Menyuan MS6.4 earthquake recorded by Menyuan Station(a)and Qingshizui Station(b)

图5 门源气象局台(a)和青石嘴台(b)的反应谱
Fig.5 The response spectrum of Menyuan MS6.4 earthquake recorded by Menyuan Station(a)and Qingshizui Station(b)

图6 10个台站水平分量与垂直分量反应谱比<br/>Fig.6 The ratio of response spectrums of vertical and horizontal components of Menyuan MS6.4 earthquake recorded by 10 stations

图6 10个台站水平分量与垂直分量反应谱比
Fig.6 The ratio of response spectrums of vertical and horizontal components of Menyuan MS6.4 earthquake recorded by 10 stations

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备注

引言

1 研究区构造背景及资料选取

2 地震动加速度峰值分析

3 加速度反应谱分析

4 结论

期刊信息