The Garhwal–Kumaun region of the Himalaya encompassing the state of Uttarakhand, India, has experienced several earthquakes in the past. Damage due to earthquakes is controlled by local site conditions, primarily resonance frequency and wave amplification from the ground. We present local site parameters with their site geology for 37 sites using ambient noise data. Horizontal to vertical spectral ratio technique is used to estimate the spectral ratio curves. Based on the type of curve, sites are classified into four classes, viz. clear peak, broad peak, double and multi‐peak, and flat H/V curve. Sites seen with clear or broad peaks are located on either soil or weathered rocks, thus indicating large impedance contrast and sharp discontinuity with large velocity contrast. Multiple peaks are observed in either soil or boulder bed and reveal large impedance contrast, probably representing shallow and thick strata. Sites with flat curves are found on weathered/phyllite/granite gneiss/granite schist rock types within highly dissected hilly areas. Fourteen sites have a peak frequency >6 Hz with a dominance of broad and clear peaks in the Lesser and Higher Himalayan regions. On the contrary, foothills and part of Siwalik sites exhibited a peak frequency between 1.14 and 4.94 Hz. The results demonstrate that sites with thick soil cover and boulder bed areas, that is, Doon valley and foothills, show low‐frequency peaks and hard rock or shallow bedrock sites, that is, Lesser and Higher Himalaya exhibit a higher frequency range. The estimated H/V amplitude and peak frequency values have shown a good correlation with site geology and geomorphology.

中文翻译：

---

使用微震观测估计印度Garhwal–Kumaun喜马拉雅山的地震局部影响

喜马拉雅山的Garhwal–Kumaun地区（包括印度的Uttarakhand州）过去曾发生过几次地震。地震造成的破坏受当地情况的控制，主要是共振频率和地面波的放大。我们使用环境噪声数据提供了37个站点的本地站点参数及其站点地质信息。水平对垂直光谱比技术用于估计光谱比曲线。根据曲线的类型，将站点分为四类，即。清晰的峰，宽峰，双峰和多峰以及平坦的H / V曲线。可见的峰清晰或宽阔的部位位于土壤或风化岩石上，因此显示出较大的阻抗对比和明显的不连续性以及较大的速度对比。在土壤或巨石床中均观察到多个峰，并显示出较大的阻抗对比，可能代表着浅而厚的地层。在高度解剖的丘陵地区，在风化/千枚岩/花岗岩片麻岩/花岗岩片岩类型上发现了具有平坦曲线的位置。14个站点的峰值频率> 6 Hz，在较小和较高的喜马拉雅山地区占主导地位的是宽阔清晰的峰。相反，山麓和锡瓦利克（Siwalik）站点的部分区域出现了1.14至4.94 Hz之间的峰值频率。结果表明，土壤覆盖较厚和卵石床区域（即Doon谷和山麓丘陵）的站点显示低频峰值，而坚硬岩石或浅基岩站点（即小喜马拉雅山和更高喜马拉雅山）显示出较高的频率范围。