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Shallow shear-wave velocity profiles and site response characteristics from microtremor array measurements in Metro Manila, the Philippines

机译:菲律宾马尼拉大都会微震阵列测量的浅剪切波速度剖面和部位响应特征

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摘要

This paper presents the outcome of reconnaissance surveys in metropolitan Manila (Metro Manilla), the Philippines, with the aim of mapping shallow shear-wave velocity structures. Metro Manila is a seismically active and densely populated region that is in need of detailed investigation of the subsurface structures, to assess local site effects in seismic hazard estimation. We conducted microtremor array observations and used the spatial autocorrelation method to estimate the shear-wave profiles at 32 sites in major geological settings in Metro Manila. We applied a hybrid genetic simulated annealing algorithm to invert phase velocity data from the spatial autocorrelation method to generate shear-wave velocity models near the global best-fit solution. The comparison between the inferred shear-wave velocity profiles and PS logging showed good agreement in terms of the fundamental mode of Rayleigh waves and site responses. Then, we utilised the inferred shear-wave velocity profiles to compute the site amplifications with reference to the motion in engineering bedrock. Subsequently, the site amplifications have been grouped, based on NEHRP site classes. The amplification factor has also been compared with the average shear-wave velocity of the upper 30 m at each site, to produce a power-law regression equation that can be used as a starting basis for further site-effects evaluation in the metropolis.
机译:本文介绍了菲律宾首都马尼拉(马尼拉大都会)的侦察调查结果,旨在绘制浅剪切波速度结构。马尼拉大都会区是一个地震活跃且人口稠密的地区,需要详细调查地下结构,以评估地震危险性评估中的局部场地影响。我们进行了微震阵列观测,并使用空间自相关方法估算了马尼拉大都会主要地质环境中32个地点的剪切波剖面。我们应用了一种混合遗传模拟退火算法,将空间自相关方法中的相速度数据求反,从而在全局最佳拟合解附近生成了剪切波速度模型。推断的剪切波速度剖面与PS测井的比较在瑞利波的基本模式和场地响应方面显示出很好的一致性。然后,我们参照工程基岩中的运动,利用推断的剪切波速度剖面来计算站点放大率。随后,根据NEHRP站点类别将站点扩增分组。还已将放大因子与每个站点上层30 m的平均剪切波速度进行了比较,以生成幂律回归方程,该方程可作为大城市中进一步站点效应评估的基础。

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