The microtremor measurements are carried out in and around the Gorakhpur city (Uttar Pradesh), India, overlain by alluvium at about 150 sites to understand the local site conditions. Horizontal-to-vertical spectral ratio (HVSR) confirms that the majority of sites have a predominant frequency of ~0.45 Hz, which may suggest the prevalence of thick soft sediments in the area. Conspicuously, a number of multiple peaks in HVSR curves at few sites may reflect the presence of different interfaces with significant impedance contrasts. Maximum amplification is observed of 4.0–5.3 to the NW–SE of the city, whilst few sites in the city are found to be associated with different values of peak amplification factor that varied between 2.0 and 4.0. It is also observed that the ground vulnerability index (K_g) in Gorakhpur city has values higher than 10.0 at most of the sites. Assimilation of 1-D velocity model for the city clearly shows that low shear wave velocity (~300 m/s) down to the depth of ~35 m, suggesting thick piles of sediments that may correspond to fluvial river system in the area, whilst the peak frequency of about 0.45 Hz may correspond to the Quaternary–Tertiary sediment boundary that may exist at deeper layers (~1000 m). The inference of this study may be used as inputs for earthquake risk management by reducing the severity of earthquake shaking through design of earthquake risk resilient structures.

微震测量在印度戈拉克布尔市（北方邦）及其周围进行，在大约 150 个地点被冲积层覆盖，以了解当地的地点条件。水平垂直光谱比 (HVSR) 证实，大多数站点的主要频率约为 0.45 Hz，这可能表明该地区普遍存在厚软沉积物。值得注意的是，HVSR 曲线中少数位置的多个峰可能反映了具有显着阻抗对比的不同界面的存在。观察到城市 NW-SE 的最大放大率为 4.0-5.3，而城市中很少有站点与在 2.0 和 4.0 之间变化的不同峰值放大系数值相关。还观察到地面脆弱性指数（K _g) 在 Gorakhpur 市，大多数站点的值都高于 10.0。城市一维速度模型的同化清楚地表明低剪切波速度 (~300 m/s) 下降到~35 m 的深度，表明可能对应于该地区河流系统的厚厚沉积物桩，同时约 0.45 Hz 的峰值频率可能对应于可能存在于更深层（~1000 m）的第四纪-第三纪沉积物边界。本研究的推论可作为地震风险管理的输入，通过设计地震风险弹性结构来降低地震震动的严重程度。