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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Seismic hazard assessment for Delhiregion
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Seismic hazard assessment for Delhiregion

机译：德里地区地震灾害评估

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Seismic hazard assessment is the process of evaluatingthe design parameters of earthquake ground motion atany site. The design parameters most widely used areintensity and peak ground acceleration (PGA). Sometimes peak velocities, peak displacements and responsespectrum are also used. Seismic hazard assessmentcan be carried out either in the deterministic framework or probabilistic framework. It is more appropriateto estimate seismic hazard at a given place in probabilistic terms. This can be done in two ways: (i) estimatingthe probability with which a prescribed level of strongground motion, say, 0.1 g (in terms of PGA), is exceededover a period of, say, 50 years; (ii) estimating the PGAwhich is exceeded with a prescribed probability, say,10%, in a period of, say, 50 years. The main objective of the present communication isto estimate earthquake hazard in Delhi region in twoways, i.e. (i) estimating the probability with which aprescribed level of strong ground motion (in terms ofPGA), is exceeded over a certain period (in years),which is taken as 50 years; and (ii) estimating thePGA which is exceeded with a prescribed probabilityover a prescribed period, which is taken as 10% probability of exceedance within 50 years. The results arepresented in the form of contour maps spreading overDelhi region depicting exceedance probabilities andPGAs. These hazard maps are of paramount importance for seismic zonation for building codes, designingearthquake-resistant new structures, estimating vulnerability of existing structures and their retrofitting,and finally for future habitat planning.
机译：地震危险性评估是评估任何地点的地震地震动设计参数的过程。最广泛使用的设计参数是强度和峰值地面加速度（PGA）。有时也使用峰值速度，峰值位移和响应谱。地震危险性评估可以在确定性框架或概率性框架中进行。用概率术语估计给定地点的地震危害更为合适。这可以通过两种方式完成：（i）估计在50年的时间内超过规定水平的强地面运动（例如PGA）0.1 g的概率; （ii）在例如50年的时间段内，以规定的概率（例如10％）估算超出的PGA。本通报的主要目的是从两个方面估算德里地区的地震危险，即（i）估算在一定时期（以年为单位）内超过规定的强地面运动水平（以PGA计）的概率，被认为是50年; （ii）估算在规定期限内以规定概率超出的PGA，将其视为50年内超出概率的10％。结果以分布在德里区域的等高线图的形式表示，描绘了超出概率和PGA。这些危害图对于建筑规范的地震分区，设计抗震的新结构，估计现有结构的脆弱性及其改建以及最终对未来的栖息地规划至关重要。

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