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首页> 外文期刊>Quaternary International >Microtremor measurement to evaluate site characteristics by horizontal to vertical spectral ratio technique in Sikkim, Northeast Himalayas, India
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Microtremor measurement to evaluate site characteristics by horizontal to vertical spectral ratio technique in Sikkim, Northeast Himalayas, India

机译：MicroTremor测量通过水平评估位点特征，垂直光谱比技术在锡克金，喜马拉雅山，印度，印度

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摘要

The measurement of site amplification of microtremors is an important tool for evaluating seismic hazard at local and regional level. The H/V spectral ratio (HVSR) method is applied to estimate the amplification of ground motion at resonance frequency. The fundamental resonance frequency is estimated at 8 different sites in study region and shows the maximum vulnerability of the site to the earthquakes. This frequency ranges between a minimum of 2.8 Hz to a maximum of 9.3 Hz. The thickness of the sediments below the surface of recording sites is calculated using the empirical relationship that comes out to be in a particular range of 9.5 m?33.1 m above the bed rock. The sedimentary thickness and the resonance frequency clearly matched with geological setting of the study area. The observation shows a slow reduction in the thickness of the sediments and increase in the resonance frequency from South-western part to North-eastern part of the study region. The results show that most of the sites are highly vulnerable to seismic risks with high amplification of seismic waves in the area. Thus, current study provides a deep insight in to the seismic hazard of the Sikkim region with a clear emphasis on the site amplification and the sedimentary cover for the region.
机译：MicroRemors的场地扩增的测量是评估当地和区域水平的地震危害的重要工具。 H / V光谱比（HVSR）方法应用于估计谐振频率下地面运动的放大。基本共振频率估计在研究区域的8个不同的部位，并显示出地震的最大脆弱性。该频率在最小值为2.8Hz至最多9.3Hz之间。使用在床岩上方的特定范围内的经验关系，计算记录部位表面以下的沉积物的厚度。沉积厚度和共振频率明显与研究区域的地质环境相匹配。该观察结果表明，沉积物厚度和从南部南部到研究区域东北部的谐振频率增加的缓慢降低。结果表明，大多数遗址高度容易受到该地区地震波高扩增的地震风险的影响。因此，目前的研究为锡克金斯地区的地震危害提供了深入的深度，以清楚地强调该区域的沉积盖。

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