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首页> 外文期刊>Natural hazards and earth system sciences >Earthquake scenario in West Bengal with emphasis on seismic hazard microzonation of the city of Kolkata, India
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Earthquake scenario in West Bengal with emphasis on seismic hazard microzonation of the city of Kolkata, India

机译：西孟加拉邦的地震情节，重点是印度加尔各答市的地震灾害微区

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Seismic microzonation is a process of estimating site-specific effects due to an earthquake on urban centers for its disaster mitigation and management. The state of West Bengal, located in the western foreland of the Assam- Arakan Orogenic Belt, the Himalayan foothills and Surma Valley, has been struck by several devastating earthquakes in the past, indicating the need for a seismotectonic review of the province, especially in light of probable seismic threat to its capital city of Kolkata, which is a major industrial and commercial hub in the eastern and northeastern region of India. A synoptic probabilistic seismic hazard model of Kolkata is initially generated at engineering bedrock (V _s~(30) ~760ms~(?1)) considering 33 polygonal seismogenic sources at two hypocentral depth ranges, 0-25 and 25-70 km; 158 tectonic sources; appropriate seismicity modeling; 14 ground motion prediction equations for three seismotectonic provinces, viz. the east-central Himalaya, the Bengal Basin and Northeast India selected through suitability testing; and appropriate weighting in a logic tree framework. Site classification of Kolkata performed following in-depth geophysical and geotechnical investigations places the city in D1, D2, D3 and E classes. Probabilistic seismic hazard assessment at a surface-consistent level - i.e., the local seismic hazard related to site amplification performed by propagating the bedrock ground motion with 10% probability of exceedance in 50 years through a 1-D sediment column using an equivalent linear analysis - predicts a peak ground acceleration (PGA) range from 0.176 to 0.253 g in the city. A deterministic liquefaction scenario in terms of spatial distribution of liquefaction potential index corresponding to surface PGA distribution places 50% of the city in the possible liquefiable zone. A multicriteria seismic hazard microzonation framework is proposed for judicious integration of multiple themes, namely PGA at the surface, liquefaction potential index, NEHRP soil site class, sediment class, geomorphology and ground water table in a fuzzy protocol in the geographical information system by adopting an analytical hierarchal process. The resulting high-resolution surface consistent hazard, liquefaction and microzonation maps are expected to play vital roles in earthquake-related disaster mitigation and management of the city of Kolkata.
机译：地震微区划是估计地震对城市中心造成的特定地点影响的过程，以减轻和管理灾害。西孟加拉邦位于阿萨姆邦-阿拉干造山带，喜马拉雅山麓和苏尔马河谷的西部前陆，过去曾遭受几次毁灭性地震的袭击，这表明有必要对该省进行地震构造审查，特别是在考虑到其首都加尔各答可能遭受地震威胁，加尔各答是印度东部和东北地区的主要工商业枢纽。首先在工程基岩（V _s〜（30）〜760ms〜（？1））上生成加尔各答的天气概率地震危险模型，其中考虑了在0-25和25-70 km的两个震源深度范围内的33个多边形地震源。 158个构造源;适当的地震活动建模;三个地震构造省份的14个地震动预测方程式，即。通过适合性测试选择了喜马拉雅中东部，孟加拉盆地和印度东北部;并在逻辑树框架中进行适当的加权。加尔各答的现场分类是在深入的地球物理和岩土工程研究之后进行的，将城市划分为D1，D2，D3和E类。在表面一致的水平上进行概率地震危险性评估-即与现场放大有关的局部地震危险性是通过使用等效线性分析通过一维沉积物柱传播基岩地面运动在50年内以超过10％的概率传播的，从而进行的-预测该城市的峰值地面加速度（PGA）范围为0.176至0.253 g。根据液化潜力指数的空间分布（对应于地面PGA分布）的确定性液化方案将城市的50％置于可能的可液化区域。提出了一个多准则的地震灾害微区划框架，通过采用模糊协议，在模糊协议中明智地整合了地表PGA，液化势指数，NEHRP土壤场地等级，沉积物等级，地貌和地下水位等多个主题。层次分析过程。预期由此产生的高分辨率地表一致灾害，液化和微区划图将在加尔各答市与地震有关的减灾和管理中发挥至关重要的作用。

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