基于S变换的河南地区形变及重力观测数据时频特征研究

本文采取S变换时频分析方法, 对弱震区(河南及邻近地区)形变及重力数据进行时频谱计算。 对扰动事件、 地震响应、 可能的构造运动信息、 以及固体潮瞬时频率特征参数进行对比分析, 结果表明: 重力的干扰成分主要集中在0.3～0.5 Hz、 0.001～0.1 Hz频段, 其中部分振动干扰呈条带分布; 0.1～0.18 Hz频段可能包含有构造运动的信息; 0.1～0.18 Hz信号的能量变化、 固体潮瞬时频率特征参数可作为应力场变化的表征, 特别是作为形变及重力远场变化的表征, 具有较好的前兆意义。

Time-frequency Analysis of Deformation and Gravity Data Observed in Henan Using S-Transform

In this paper, we use S-transform method to calculate time-frequency spectrum of deformation and gravity data on weak seismicity region (Henan and surrounding areas). Comparing and analyzing disturbance events, seismic response, possible tectonic movement information, as well as, the instantaneous frequency characteristic parameters of Earth tide, the result shows that disturbing components of gravity mainly concentrate on 0.3~0.5 Hz, 0.001~0.1 Hz, and part of vibration has a strip distribution. Tectonic information may be contained in 0.1~0.18 Hz, and the energy changes in 0.1~0.18 Hz and instantaneous frequency characteristic parameters of Earth tide can be used to demonstrate the change of stress field, especially, for the far-field deformation and gravity changes, they have good precursory significance.