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《Recent Developments in World Seismology》 2008-12
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More Evidence for the Existence of A Density—Tectonic Stress Wave with Ultra-Low Frequency Before Earthquakes

Zhao Fuyuan(National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China)  
We have argued that there is a density—tectonic stress wave with ultra-Low frequency before earthquakes(WULF),which characters are agree well with the thermodynamical elastic-rebound model suggested by Rundle.Three kinds of real observational materials have been sampled:the astrometric residual anomalies of universal time and latitude,the anomalies of earth apparent resistivity,as well as the crustal deformation prior to earthquakes,to verify the existence of WULF.We now find that in the long period of observations and monitoring of earthquakes in China,more materials,which could indicate WULF,had been obtained and published.We compare the characters of WULF and several different kinds of real observational materials selected and depicted in this paper,it is deemed that the source of WULF might be the very slow but fierce disturbance of density and tectonic stress underground.
【CateGory Index】: P315.72
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