The horizontal-to-vertical spectral ratio (HVSR) has been widely used to calculate near-surface site effects including fundamental resonance frequency and soil amplification. In this study, we investigated the features of HVSR in order to assess the reliability of this method. The main premise of Nakamura (1989; Nakamura, Y., 2000. Clear identification of fundamental idea of Nakamura's technique and its applications. In: Proceedings of the 12th World Conference on Earthquake Engineering. Auckland, New Zealand.) HVSR method is to assume there are little to no amplification or de-amplification of motion recorded by the vertical component. In this study, we disregarded this assumption and used different proposed spectral ratios of earthquake accelerograms to examine and evaluate the accuracy of the HVSR technique. In addition, to increase the accuracy of the results, near-surface attenuation parameter Kappa (\({\rm K}\)), as an important spectral decay parameter which has influence on the site effects, has been incorporated in proposed spectral ratios. The efficiency of proposed spectral ratios was evaluated using 3948 accelerograms (Includes surface and borehole stations) of 496 earthquakes from 18 KiK-net accelerometery stations of the two regions of Japan with moment magnitudes ranging from 3 to 5. The two selected areas have different geological characteristics and different site effects parameters. According to the results, The HVSR method is under-determined at stations where the waves are mainly amplified as they pass through the site. Moreover, in a single station by calculating the amplification value on the vertical component, Site effects measurements obtained from surface and borehole data along with classical HVSR technique have a lower mean absolute error than those obtained by using HVSR technique alone.

水平垂直光谱比 (HVSR) 已被广泛用于计算近地表场地效应，包括基本共振频率和土壤放大。在本研究中，我们研究了 HVSR 的特征，以评估该方法的可靠性。Nakamura 的主要前提 (1989; Nakamura, Y., 2000。Nakamura 技术的基本思想及其应用的清晰识别。在：第 12 届世界地震工程会议论文集。奥克兰，新西兰。) HVSR 方法是假设垂直分量记录的运动几乎没有放大或去放大。在这项研究中，我们忽略了这一假设，并使用不同的地震加速度图谱比来检查和评估 HVSR 技术的准确性。此外，\({\rm K}\))，作为影响现场效应的重要光谱衰减参数，已被纳入建议的光谱比率。使用来自日本两个地区的 18 个 KiK-net 加速度计站的 496 次地震的 3948 次加速度图（包括地表和钻孔站）评估建议的频谱比的效率，力矩震级从 3 到 5。这两个选定的区域具有不同的地质特性和不同的场地效应参数。根据结果​​，在波主要在通过站点时被放大的站点，HVSR 方法是欠确定的。而且，在单站中通过计算垂直分量上的放大值，