安徽霍山地区区域科学台阵为“十三五”期间新建台阵，为了评估该台阵各子站背景噪声水平，采用噪声功率谱密度法和功率谱概率密度函数法，进行背景噪声数据分析，结果显示：参照台基分类标准，Ⅰ类台基13个，Ⅱ类台基5个，Ⅲ类台基1个，Ⅳ类台基1个，台基噪声水平整体较低，各子站台基勘选较为合理；CLZ站UD分量背景噪声偏大，需要对观测系统运行进行检查；各子站背景噪声概率密度函数分布结果同功率谱密度结果基本一致，但包含的细节或信息更多，特别是叠加噪声功率谱密度后，包含了背景噪声在时间和频率2个维度上的信息，能够显著显示人类活动、仪器标定等干扰在频率、时间上分布。
The Anhui Huoshan regional seismic array was newly built during the 13th Five-Year Plan period. To assess the background noise level of each station of the array, noise analysis was conducted using noise power spectral density and power spectral probability density function methods on background noise data. The results show that, according to the classification standard of station bases, there are 13 ClassⅠ stations, 5 ClassⅡstations, 1 ClassⅢ station, and 1 Class Ⅳ station. The overall noise level of the station bases is relatively low, and the selection of the station bases is reasonable. The background noise of the UD component at the CLZ station is relatively high, and it may be necessary to check whether the observation system is working properly. The probability density function distribution of background noise in each station is basically consistent with the power spectral density of background noise, but it contains more details or information. Especially after the superposition of noise power spectral density, it contains information about background noise in both time and frequency dimensions, which can significantly display the distribution of interference, calibration, and other disturbances in frequency and time.
2024,45(2): 44-51 收稿日期：2023-09-06
DOI：10.3969/j.issn.1003-3246.2024.02.006
基金项目：安徽省地震局地震科研青年项目（项目编号：2023QN04）
作者简介：周志（1986—），男，工程师，主要从事地震监测预报工作。E-mail：807545519@qq.com
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