【摘要】 为了合理评估地震台站观测场地等级以挖掘地震观测潜力，需要对地震台站背景噪声进行分析并获得对其特征的客观认识。使用两年的连续同址观测数据，对红山台背景噪声进行分析，提出天然背景噪声的提取方法。结合概率统计，给出台站综合背景噪声区间模型（CBNM）及其典型值，给出台站天然背景噪声区间模型（NBNM）及其典型值。研究发现CBNM的下边界在440 s至2 s的频率区间低于新低噪声模型（NLNM）,NBNM的下边界在1 000 s至2 s的频率区间低于NLNM，在低于33 s的频段NBNM整体上比CBNM低几个分贝。结果表明了天然背景噪声提取方法的有效性，为修订由Peterson于1993年提出的全球噪声模型和建立符合我国区域特征的背景噪声模型提供了基础。更多还原

【Abstract】 To reasonably evaluate the site classification of seismic stations and tap into their seismic observation potential, it is necessary to analyze the background noise of seismic stations and obtain an objective understanding of its characteristics. Using two years of continuous co-located observation data, this study analyzed the background noise at the Hongshan station and proposed a method for extracting natural background noise. Combining probability statistics, a comprehensive background noise model(CBNM) and its typical values for the station were established, along with a natural background noise model(NBNM) and its typical values. The results indicated that the lower boundary of the CBNM was below the new low noise model(NLNM) in the frequency range from 440 s to 2 s. The lower boundary of the NBNM was below the NLNM in the frequency range from 1000 s to 2 s. In the frequency bands below 33 s, the NBNM was overall several decibels lower than the CBNM. The results demonstrate the effectiveness of the natural background noise extraction method, providing a foundation for revising the global noise model proposed by Peterson in 1993 and for establishing background noise models tailored to the regional characteristics of China.更多还原