摘要
用2005年林甸MS5.1级地震前后震中附近的地震资料,选择与地震强度有关的3级以上地震频次N、b值、Mf值、C值、和Ac值等6个参量进行主成分分析,实现对上述参量的有效约简。这6个参量之间有一定的相关性,各参量在不同时段的变化各有所异,预报效果并不理想。但是根据主成分分析可以得到反映地震强度的综合指标W,发现该指标在震源区附近出现明显的异常变化,震后异常恢复。表明综合指标W可以较好的反映地震活动的异常特征。
The primary component analysis were made by the data near the seismic epicenter of Lindian MsS.1 earthqauake and selecting the parameter N （ME ≥3.0）, b, η, Mf, c, Ac, value which had relation to the earthquake strenth, it was achieved to reduce the above-metioned parameters effectively. There were some relativities among 6 parameters and each one was different in distinct stages, but the earthquake intensity synthetic index W can be gained by the primary component analysis. W value showed obvious anomalies before Lindian earthquake and returned to normal after that. It showed that the synthetic index W can reflect the anomolous characteristics of the seismicity.
出处
《东北地震研究》
2008年第2期29-34,共6页
Seismological Research of Northeast China
关键词
主成分分析
相关性
特征向量
贡献率
primary component analysis method
relativity
eigenvector
contribution rate
