摘要
综述了极大熵谱分析的原理及Burg递推算法,选取应变能∑E_1^(1/2)地震活动度∑A_1为采样序列,对三个时段的资料进行了极大熵谱分析。结果表明;两个序列所得结果较为一致。山西地震带中强震活动和华北中强震活动同步变化,且主要受321年和347年显著周期控制。其35年和66年短周期活动与太阳活动和地球自转31年和60年长周期较接近,表明地震活动在总体上受太阳活动与地球自转速率变化控制,短周期成份反映了发生地震地区应力场能量积累和释放的特点。
The principle of maximum entropy analysis and Burg recurrence algorithm have been described in this paper. The sampling sequences of the strain energy E and degree of seismic activity ΣAi have been chosen to carry out the maximum entropy analysis on three-time intervals. The results obtained from the two sequences are relatively simular. It showed that both activities of strong earthquake in Shanxi seismic zone and those in North China change synchronously and mainly controlled by the long period activity of 321 and 347 years respectively. The short period activity of 35 and 66 years is relatively close to the long period of solar activity and the earth rotation shows that seismic activities are generally depended upon the solar activity and the rate of earth rotation. The short period reflects the features of regional stress accumulation and release in this paper.
出处
《内陆地震》
1992年第3期246-251,共6页
Inland Earthquake
关键词
地震带
地震序列
极大熵谱分析
Maximum entropy spectrum analysis FFT algorithm Power spectrum Filtering coefficient