地震研究

收集、筛选并整理了2001—2019年我国黄土地区发生的141次MS2.4～6.7地震的1 092条台站记录,选取台站中两水平向峰值加速度偏高的值作为拟合值,采用两步回归法拟合得到了我国黄土地区水平向土层地震动衰减关系,分析了地震动残差随震级和距离的分布趋势,并将衰减关系和已有研究成果进行了对比。结果表明:绝大多数实测值均在拟合峰值加速度衰减曲线±1倍标准差范围以内,模型能较好地反映中国黄土地区峰值加速度随距离衰减的趋势。

In this paper,1 092 pieces of records of 141 seismic events occurring in the Loess region of China from 2001 to 2019 were sorted out.The higher values of the two horizontal peak accelerations are selected as the fitting values,and the Two-step Regression method is used to obtain the horizontal ground-motion attenuation relation in the Loess region of China.The distribution of residuals related with magnitude and distance is analyzed,and the attenuation relation proposed in this paper is compared with the ones proposed by other researchers.The results show that most of the observed values are within the range of ±1 standard deviation of the acceleration attenuation curve,and the model proposed in this paper can better reflect the peak acceleration's attenuation trend with distance in the Loess region of China.

引言
1 强震动数据的收集与处理
2 地震动衰减模型与回归分析方法
3 模型回归结果
4 可靠性分析
5 结论

图1 2001—2019年黄土地区MS2.4～6.7地震和台站分布<br/>Fig.1 Distribution of MS2.4-6.7 earthquakes from 2001 to 2019 and seismic stations in the study area

图1 2001—2019年黄土地区MS2.4～6.7地震和台站分布
Fig.1 Distribution of MS2.4-6.7 earthquakes from 2001 to 2019 and seismic stations in the study area

图2 异常台站加速度时程曲线图<br/>Fig.2 Abnormal acceleration-time history recorded by a station

图2 异常台站加速度时程曲线图
Fig.2 Abnormal acceleration-time history recorded by a station

图3 震级—震中距分布图<br/>Fig.3 Magnitude vs epicentral distance

图3 震级—震中距分布图
Fig.3 Magnitude vs epicentral distance

图4 MS3.6(a)、MS4.6(b)、MS5.8(c)及MS6.4(d)地震的PGA衰减曲线与实测值的对比<br/>Fig.4 Comparison between the attenuation curves and the observed PGA values of MS3.6(a),MS4.6(b),MS5.8(c)and MS6.4(d)earthquakes

图4 MS3.6(a)、MS4.6(b)、MS5.8(c)及MS6.4(d)地震的PGA衰减曲线与实测值的对比
Fig.4 Comparison between the attenuation curves and the observed PGA values of MS3.6(a),MS4.6(b),MS5.8(c)and MS6.4(d)earthquakes

图5 地震动残差均值随震级(a)和距离(b)分布<br/>Fig.5 PGA residuals means vs magnitude(a)and epicentral distance(b)

图5 地震动残差均值随震级(a)和距离(b)分布
Fig.5 PGA residuals means vs magnitude(a)and epicentral distance(b)

图6 本文模型与我国青藏区和中国西部地区模型对比<br/>Fig.6 Comparison of the model proposed in this paper with the model of Qinghai-Tibet region by Yu et al(2013)and the model of Western China by Wang et al(2000)

图6 本文模型与我国青藏区和中国西部地区模型对比
Fig.6 Comparison of the model proposed in this paper with the model of Qinghai-Tibet region by Yu et al(2013)and the model of Western China by Wang et al(2000)

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备注

引言

1 强震动数据的收集与处理

2 地震动衰减模型与回归分析方法

3 模型回归结果

4 可靠性分析

5 结论

期刊信息