地震研究

将美国Shakemap场地校正方法用于云南地震动强度和烈度速报工作,通过分析Shakemap场地校正方法及其要点,将该方法应用于云南典型区域与实际场地情况进行对比分析,探讨了Shakemap场地校正方法相关参数问题,认为将该方法用于研究云南地区时应对相关参数做一些改进,首先要对其只基于地形坡度单指标的场地条件分类进行补充,即应该考虑V³⁰_S与多指标因素的相关性(如近地表地质状况、高程、距离河流的距离等)。同时,必须从实际场地情况出发考虑局部场地条件对地震动的影响,主要从盆地软弱土层、地质构造条件和局部砂土液化场地等方面修正局部场地条件对地震动的放大作用。这样,在完善理论计算结果的基础上结合对实际场地情况的修正,通过理论与实际双重的校正,达到提高预测结果精度的效果,为震后的应急决策提供有用的信息和帮助。

Appling the Shakemap site correction methods of U.S. for the rapid prediction of ground motion intensity and seismic intensity in Yunnan,we analyzed Shakemap site correction method and its main points,and applied it to the comparison and analysis of typical regions in Yunnan and the actual site conditions,and discussed the relevant parameters problems of it. We should improve the relevant parameters of Shakemap site correction method in Yunnan. Firstly,we supplied the classification of site conditions only based on topographic slope single indicator,which should be considered the correlation between V³⁰_S and multi-index factors(such as the near-surface geological conditions,elevation,the distance from the river etc.).At the same time,we must consider the impact of local site conditions on ground motion in the actual site conditions and modified the amplification of local site conditions on ground motion from the soft soil of basin,the geological structure and the local sand liquefaction sites etc.. Basing on the theoretical calculation results,combining with modifying actual site conditions,we could improve the precision of predicted results by double correction of theoretical and practical,which could provide useful information and help for emergency decision after the earthquake.

引言
1 Shakemap场地校正方法研究
2 Shakemap场地校正方法在云南地区的实际应用
3 Shakemap场地校正方法在云南地区的应用分析
4 结语

图1 考虑场地影响的Shakemap计算流程图<br/>Fig.1 Shakemap calculation flow considering site influence

图1 考虑场地影响的Shakemap计算流程图
Fig.1 Shakemap calculation flow considering site influence

表1 坡度范围与NEHRP V30S、NEHRP场地分类的关系<br/>Tab.1 The relationship between slope range and NEHRP V30S、 NEHRP site classification

表1 坡度范围与NEHRP V30S、NEHRP场地分类的关系
Tab.1 The relationship between slope range and NEHRP V30S、 NEHRP site classification

表2 NEHRP场地分类下的场地放大系数<br/>Tab.2 Site amplification factor in the NEHRP site classification

表2 NEHRP场地分类下的场地放大系数
Tab.2 Site amplification factor in the NEHRP site classification

图2 宁洱6.4地震烈度区及强震动台站分布图<br/>Fig.2 Distribution of seismic intensity zone and strong-motion station in Ning'er 6.4 earthquake

图2 宁洱6.4地震烈度区及强震动台站分布图
Fig.2 Distribution of seismic intensity zone and strong-motion station in Ning'er 6.4 earthquake

表3 研究区各强震动台站记录参数<br/>Tab.3 Recording parameters of the strong-motion station in study area

表3 研究区各强震动台站记录参数
Tab.3 Recording parameters of the strong-motion station in study area

表4 烈度与加速度的对应关系<br/>Tab.4 Corresponding relationship between seismic intensity and acceleration

表4 烈度与加速度的对应关系
Tab.4 Corresponding relationship between seismic intensity and acceleration

表5 研究区各强震动台站的场地类型<br/>Tab.5 Site style of the strong-motion station in study area

表5 研究区各强震动台站的场地类型
Tab.5 Site style of the strong-motion station in study area

表6 美国场地分类下各强震台站的场地放大系数<br/>Tab.6 Site amplification factor of the strong-motion station in U.S. site classification

表6 美国场地分类下各强震台站的场地放大系数
Tab.6 Site amplification factor of the strong-motion station in U.S. site classification

表7 研究区各强震动台站的场地情况<br/>Tab.7 Site condition of the strong-motion station in study area

表7 研究区各强震动台站的场地情况
Tab.7 Site condition of the strong-motion station in study area

表8 适用于中国场地分类的场地放大系数<br/>Tab.8 Site amplification factor applies to the China site classification

表8 适用于中国场地分类的场地放大系数
Tab.8 Site amplification factor applies to the China site classification

表9 中国场地分类下各台站的场地放大系数<br/>Tab.9 Site amplification factor of the strong-motion station in China site classification

表9 中国场地分类下各台站的场地放大系数
Tab.9 Site amplification factor of the strong-motion station in China site classification

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备注

引言

1 Shakemap场地校正方法研究

2 Shakemap场地校正方法在云南地区的实际应用

3 Shakemap场地校正方法在云南地区的应用分析

4 结语

期刊信息