Characteristics of the correlation coefficient of spectral amplitude of earthquake sequences in western Yunnan region since 2008
Huang Hao
Fu Hong
Abstract：Using digital seismic waves recorded by Yunnan Digital Seismic Net-work,we calculated the correlation coefficient of spectral amplitude of six MS ≥4.0 earthquake sequences occurred from 2008 to 2011 in western Yunnan re-gion.The results suggest that the correlation coefficient of spectral amplitude of earthquake sequences are generally high value,no matter the sequence is fore-shock,main shock-aftershock or earthquake swarm,which may be caused by high stress filed in the source region.A smaller correlation coefficient of spec-tral amplitude,which means less consistency of focal mechanisms and low level of stress filed,can be used as an index to predict that larger earthquakes will not follow behind.The correlation coefficient of spectral amplitude of foreshock sequence is larger;however,a larger correlation coefficient does not indicate the earthquake sequence is foreshock.A larger correlation coefficient of spectral amplitude only implies high level of the stress field,but it is beneficial to occur-ring MS ≥5.0 earthquake in the source region.
Keywords：earthquake sequencewestern Yunnan regioncorrelation coeffi-cient of spectral amplitudeconsistency of focal mechanism
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 631-639 )