﻿ 联合钻孔资料及地形数据估算宝鸡地区<i>v</i><sub>S</sub>30
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 地震地磁观测与研究  2018, Vol. 39 Issue (1): 117-122  DOI: 10.3969/j.issn.1003-3246.2018.01.019 0

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Shao Dan, Sun Zhe, Tian Qinhu. Estimate vS30 base on drill data and DEM in Baoji area[J]. Seismological and Geomagnetic Observation and Research, 2018, 39(1): 117-122. DOI: 10.3969/j.issn.1003-3246.2018.01.019.

文章历史

Estimate vS30 base on drill data and DEM in Baoji area
Shao Dan, Sun Zhe, Tian Qinhu
Shaanxi Earthquake Agency, Xi'an 710068, China
Abstract: The vS30 approximation of sites is acquired by correlations between vS30 and slopes after the calculation of the slope of topography using DEM data. In order to improve the precision of vS30, the actual drilling data in Baoji area is used. The difference between the estimated value of vS30 and the measured value is analyzed as well as the spatial variation trend of the variance. Based on all above, the vS30 which estimated from the model is amended. The work laid the foundation for the ground motion attenuation characteristics in Baoji area.
Key Words: drill    DEM    vS30    dstimate
0 引言

1 基于地形坡度的vS30估算

 图 1 宝鸡地区vS30估算 Fig.1 Estimate vS30 in Baoji area
2 基于钻孔资料修正vS30 2.1 数据及预处理

 图 2 钻孔数据分布 Fig.2 Distribution of drill data

 $\lg {v_{\rm{S}}}\;30 = a + b \times \lg {v_{\rm{S}}}\left(d \right)$ (1)

 图 3 不同深度处vS(d)和vS30的线性拟合 Fig.3 Fit vS(d) and vS30 in different deep

2.2 vS30残差分析及修正

 图 4 宝鸡地区vS30残差分布 Fig.4 Residual distribution of vS30 in Baoji area

vS30残差预测分布与模型估算结果进行空间叠加，即可得到研究区域修正后的vS30分布（图 5）。对比宝鸡地区修正前后的vS30分布，发现大部分区域vS30基本展布形态未发生趋势性转变，只在个别区域幅值有所变化。

 图 5 修正后宝鸡地区vS30分布 Fig.5 Distribution of vS30 after modification in Baoji area
2.3 基于NEHRP的场地分类

 图 6 宝鸡地区修正前后场地分类 (a)修正前；(b)修正后 Fig.6 Site classification before and after modification in Baoji area

3 结果与讨论

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