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Site-specific earthquake response study for hazard assessment in KolkataTI Site-specific earthquake response study for hazard assessment in Kolkata city, India

机译：印度加尔各答市特定地点的地震反应研究以进行危害评估印度加尔各答市特定地点的地震反应研究以危害评估

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The assessment of local site effects on seismic ground motions is of great importance in earthquake engineering practice. Several destructive earthquakes in the past have demonstrated that the amplification of ground motion and associated damage to structures due to local site conditions is a significant consideration in earthquake hazard analysis. A recent paper published in this journal highlights the hazard posed by earthquakes in the megacity of Kolkata in India due to its seismic and geological settings. The seismic hazard assessment study speculates that the deep alluvial deposit in the city may increase the seismic hazard probably due to the amplification of the seismic energies. This paper focuses on the seismic response studies of the various soil strata (i.e. for local subsurface conditions) obtained from various construction sites in the city for predicted earthquake. It is very well recognized that site response studies (a part of seismic microhazard zonation for urban areas) are the first step towards performance-based foundation design or seismic risk analysis and mitigation strategy. One of the problems for carrying out site-specific study in Kolkata is the lack of recorded strong motion data in the city. Hence, this paper outlines a methodology to carry out site-specific study, where no strong motion data or seismic data are available. The methodology uses wavelet-based spectrum compatibility approach to generate synthetic earthquake motions and equivalent linear method for seismic site response analysis. The Mega City of Kolkata has been considered to explain the methodology. Seismic hazard zonation map by the Bureau of Indian Standards classifies the City of Kolkata as moderate seismic zone (Zone III) with a zone factor 0.16. On the other hand, GSHAP(Global Seismic Hazard Assessment Program) map which is based on 10% probability of exceedance in 50 years specifies a maximum peak ground acceleration (PGA) of 1.6 m/s(2) (0.163 g) for this region. In the present study, the seismic response has been carried out based on GSHAP. The results of the analysis indicate the amplification of ground motion in the range of 4.46-4.82 with the fundamental period ranging from 0.81 to 1.17 s. Furthermore, the maximum spectral accelerations vary in the range of 0.78-0.95 g.
机译：在地震工程实践中，评估局部场地对地震地震动的影响非常重要。过去发生的几次破坏性地震表明，地震危险性分析中考虑了地震动的放大以及因当地情况而对建筑物造成的相关破坏。最近在该杂志上发表的一篇论文强调了印度加尔各答特大城市地震和地质环境对地震造成的危害。地震危险性评估研究推测，城市中的深冲积层可能会增加地震能量，从而增加地震危险性。本文重点研究了从城市中各个建筑地点获得的用于预测地震的各种土壤层（即针对局部地下条件）的地震响应研究。众所周知，现场响应研究（城市地区地震微灾分区的一部分）是基于性能的基础设计或地震风险分析与缓解策略的第一步。在加尔各答进行特定地点研究的问题之一是该城市缺乏记录的强运动数据。因此，本文概述了在没有强运动数据或地震数据的情况下进行特定地点研究的方法。该方法使用基于小波的频谱兼容性方法生成合成地震运动，并使用等效线性方法进行地震现场响应分析。已经考虑到加尔各答大城市来解释这种方法。印度标准局的地震危险区划图将加尔各答市分类为中度地震区（III区），其区域因子为0.16。另一方面，基于50年内超过10％的超过概率的GSHAP（全球地震危险性评估计划）地图指定了该区域的最大地面加速度（PGA）为1.6 m / s（2）（0.163 g） 。在本研究中，地震响应是基于GSHAP进行的。分析结果表明，地震动的放大倍数为4.46-4.82，基本周期为0.81至1.17 s。此外，最大光谱加速度在0.78-0.95 g的范围内变化。

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