The horizontal‐to‐vertical spectral ratio (HVSR) for seismic ambient noise is a popular method that can be used to estimate the predominant frequency at a given site. In this article, we introduce the Incorporated Research Institutions for Seismology (IRIS) Data Management Center’s (DMC’s) openly available HVSR station toolbox. These tools offer a variety of ways to compute the spectral ratio by providing different averaging routines. The options range from the simple average of spectral ratios to the ratio of spectral averages. Computations take advantage of the available power spectral density estimates of ambient noise for the seismic stations, and they can be used to estimate the predominant frequency of the many three‐component seismic stations available from the IRIS DMC. Furthermore, to facilitate the identification of the peaks in HVSR profiles for the assessment of the predominant frequency of station sites, the toolbox can also process the results of HVSR analysis to detect and rank HVSR peaks. To highlight the toolbox capabilities, three different examples of possible use of this toolbox for routine site‐effect analysis are discussed: (1) site effects related to thawing in Arctic regions, (2) ground‐motion amplification in urban area, and (3) estimation of station VS30⁠.

中文翻译：

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水平对垂直光谱比（HVSR）IRIS工作站工具箱

地震环境噪声的水平与垂直频谱之比（HVSR）是一种流行的方法，可用于估计给定站点的主要频率。在本文中，我们介绍了美国地震联合研究所（IRIS）数据管理中心（DMC）公开可用的HVSR站工具箱。这些工具通过提供不同的平均例程，提供了多种方法来计算频谱比。选项范围从简单的频谱比率平均值到频谱平均值比率。计算利用了地震台站周围噪声的可用功率谱密度估计值，它们可用于估计IRIS DMC提供的许多三分量地震台站的主要频率。此外，为了便于识别HVSR曲线中的峰以评估站点的主要频率，该工具箱还可以处理HVSR分析的结果，以检测和排序HVSR峰。为了突出工具箱的功能，讨论了使用此工具箱进行常规站点效果分析的三个不同示例：（1）与北极地区解冻相关的站点效果；（2）城市地区的地面运动放大；以及（3） ）对VS30⁠电台的估算。