摘要
利用福建省数字地震台网记录的波形数据,计算了水口和仙游地震序列的谱振幅相关系数,结果显示水口序列谱振幅相关系数在0.90-0.98之间变化,相关系数高,序列地震震源机制解相似程度高;仙游序列谱振幅相关系数在0.72-0.81之间变化,相关系数略低,震源机制解整体相似程度不高。结合福建地区同期地震活动背景水平分析认为,较高的谱振幅相关系数与福建地区较高的背景应力积累水平存在一定相关性。水口和仙游序列谱振幅相关系数时序变化显示,序列最大地震发生前的谱振幅相关系数存在上升变化,显示较大地震发生前震区应力水平有增强迹象。
By using digital seismic waves recorded by Fujian Digital Seismic Network, the paper calculated the correlation coefficient of spectral amplitude of Shuikou and Xianyou earthquake sequences. The results shows that the correlation coefficient of spectral amplitude of Shuikou varies between 0.90-0.98, the high value of correlation coefficient indicates that the focal mechanism of the Shuikou small earthquakes are more consistent;the correlation coefficient of spectral amplitude of Xianyou varies between 0.72-0.81, the lower value of correlation coefficient indicates that the focal mechanism of the Shuikou small earthquakes are less consistent.Considering the seismicity background in Fujian area, the high correlation coefficient of spectral amplitude is related to the high background stress level in Fujian. The rising changes of correlation coefficient of spectralamplitude before maximum earthquake may be caused by the enhance of regional stress level.
出处
《华南地震》
2016年第3期35-42,共8页
South China Journal of Seismology
基金
福建省地震局青年科技基金(Y201302)资助
关键词
地震序列
谱振幅相关系数
震源机制一致性
应力水平
Earthquake sequence
Correlation coefficient of spectral amplitude
Consistency of focal mechanism
Stress level
