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首页> 外文期刊>Bulletin of the International Institute of Seismology and Earthquake Engineering >A SITE AMPLIFICATION STUDY USING OBSERVEDRECORDS AT BMD, DHAKA FOR SEISMICMICROZONATION
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A SITE AMPLIFICATION STUDY USING OBSERVEDRECORDS AT BMD, DHAKA FOR SEISMICMICROZONATION

机译：利用达卡BMD观测记录进行地震微分区的现场放大研究

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摘要

Dhaka city is currently seismically vulnerable both in natural and social condition, therefore seismicdisaster management microzonation is indispensable. In this process, local site amplification plays animportant role. For this purpose, due to shortage of soil data, a number of horizontal-to-verticalspectral ratio (H/V) for microtremor was already applied to estimate predominant period andamplification factor for geomorphological types, but without verification using real earthquake records.However, there are earthquake records obtained by the vertical array at the Bangladesh MeteorologicalDepartment (BMD), Dhaka. In this study, in order to investigate an appropriate way to estimate site amplification due tosubsurface soil for seismic microzonation of Dhaka, actual amplifications calculated using six actualsmall earthquake records are compared with the existing results of H/V for microtremor. This studyprovides the conclusions: (a) The predominant period estimated using H/V for micrtremor is in a goodagreement with those estimated using the real small earthquake records, (b) The amplification factor ofPGV and the amplitude spectra show some differences between the real small earthquake records andthe existing results of H/V for microtremor, (c) the predominant periods of the existing H/V formicrotremor can be used for microzonation of Dhaka city, whereas the amplification factors estimatedfrom them cannot be used directly, but more careful investigations are required. Finally we expect theresults of this paper can be a clue for preparation of practical seismic microzonation for Dhaka city.
机译：达卡市目前在自然和社会条件下都容易受到地震的破坏，因此地震灾害管理的微分区是必不可少的。在此过程中，本地站点放大起着重要作用。为此，由于土壤数据的缺乏，许多微震的水平/垂直光谱比（H / V）已经被用于估算地貌类型的主要周期和放大因子，但是没有使用真实的地震记录进行验证。达卡的孟加拉国气象部门（BMD）的垂直阵列获得了地震记录。在这项研究中，为了研究一种合适的方法来估算达卡地震微带的地下土壤引起的场地放大，将使用六个实际小地震记录计算的实际放大率与现有的H / V微震结果进行了比较。这项研究提供了以下结论：（a）使用H / V估计的微震的主要时期与使用真实小地震记录所估计的时期相吻合，（b）PGV的放大因子和振幅谱显示真实小地震之间的某些差异地震记录和现有的微震H / V结果，（c）现有的微震H / V的主要时期可以用于达卡市的微区划，而从中估算出的放大因子不能直接使用，但更仔细的研究是需要。最后，我们希望本文的结果可以为达卡市实际地震微区的制备提供线索。

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