吉林省地磁观测时间序列噪声特性研究

Study on Noise Characteristics of Time Series of Geomagnetic Observation in Jilin

在地震预报研究中,地磁观测手段被认为是在众多手段中较为可靠的观测手段。现代地球物理成果显示,观测数据的时间序列含有多种噪声,可以构造或选择最佳的噪声统计模型描述观测噪声,从而了解噪声特性并且获得噪声功率谱及其含量。文章对吉林省2个台站的地磁观测7个时间序列采用最大似然估计法对其所含噪声进行特性分析。通过估计噪声模型参数,发现地磁观测时间序列所含噪声可用经典幂率噪声描述,且谱指数介于-1至-2之间。

In the earthquake prediction studies, geomagnetic observation is considered to be one of reliable observation means. Modern geophysical study shows that the time series of observational data contain a variety of noise. Measured noise can be described by choosing or constructing the best statistical noise model to get to understand the noise characteristics and to get noise power spectrum and its component. Noise characteristics of seven time series of geomagnetism from two stations in Jilin Province are analyzed, by using the maximum likelihood estimation in this paper. Estimated the noise model parameters show that the noises contained in the geomagnetic observation time series can be described by classical power noise, with spectral index ranged from - 1 to - 2.