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首页> 外文期刊>Journal of Applied Geophysics >Site classification and estimation of surface level seismic hazard using geophysical data and probabilistic approach
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Site classification and estimation of surface level seismic hazard using geophysical data and probabilistic approach

机译：利用地球物理数据和概率方法进行场地分类和地表地震危险性估算

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This paper presents the site classification of Bangalore Mahanagar Palike (BMP) area using geophysical data and the evaluation of spectral acceleration at ground level using probabilistic approach. Site classification has been carried out using experimental data from the shallow geophysical method of Multichannel Analysis of Surface wave (MASW). One-dimensional (1-D) MASW survey has been carried out at 58 locations and respective velocity profiles are obtained. The average shear wave velocity for 30 m depth (Vs(30)) has been calculated and is used for the site classification of the BMP area as per NEHRP (National Earthquake Hazards Reduction Program). Based on the Vs(30) values major part of the BMP area can be classified as "site class D", and "site class C'. A smaller portion of the study area, in and around Lalbagh Park, is classified as "site class B". Further, probabilistic seismic hazard analysis has been carried out to map the seismic hazard in terms spectral acceleration (S-a) at rock and the ground level considering the site classes and six seismogenic sources identified. The mean annual rate of exceedance and cumulative probability hazard curve for S. have been generated. The quantified hazard values in terms of spectral acceleration for short period and long period are mapped for rock, site class C and D with 10% probability of exceedance in 50 years on a grid size of 0.5 km. In addition to this, the Uniform Hazard Response Spectrum (UHRS) at surface level has been developed for the 5% damping and 10% probability of exceedance in 50 years for rock, site class C and D. These spectral acceleration and uniform hazard spectrums can be used to assess the design force for important structures and also to develop the design spectrum.
机译：本文利用地球物理数据介绍了班加罗尔Mahanagar Palike（BMP）地区的站点分类，并使用概率方法评估了地面上的光谱加速度。使用来自表面波多通道分析（MASW）的浅层地球物理方法的实验数据进行了场地分类。在58个位置进行了一维（1-D）MASW测量，并获得了各自的速度分布图。已计算出30 m深度的平均剪切波速度（Vs（30）），并根据NEHRP（美国国家地震减灾计划）将其用于BMP区域的现场分类。根据Vs（30）值，BMP区域的主要部分可分为“场所类D”和“场所类C”。在Lalbagh公园及其周围地区，研究区域的一小部分被归类为“场所”。此外，还进行了概率地震危险性分析，以考虑地点类别和确定的六个地震发生源，根据岩石和地面上的频谱加速度（Sa）绘制地震危险性图。平均年超出率和累积绘制了S.的概率危险曲线，绘制了短期和长期频谱加速度的定量危险值，绘制了岩石，C级和D级场地，其在50年内的网格大小为0.5的概率超过10％除此之外，针对C级和D级场地的岩石，在50年内对5％的阻尼和超过10％的超过概率开发了地表统一危险响应谱（UHRS）。光谱仪ms可以用于评估重要结构的设计力，还可以开发设计范围。

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