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《Chinese Journal of Geophysics》 1983-06
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THE TEMPORAL VARIATION OF THE ORIENTATION OF THE MEAN STRESS AXIS BOTH BEFORE AND AFTER THE STRONG LONGLING EARTHQUAKE

KAN BONG-JU LIU ZU-YIN WANG SHAO-JIN SONG WEN HUANG YU-ZHEN(The Seismological Institute of Yunnan Province)  
The temporal variation of the mean nodal plane solution of small earthquakes occurred in Longling region, Yunnan Province from 1971 to 1980 is studied in this paper based on the data obtained by the regional seismic networks. The results are as follows: 1) The P-axis azimuth of the mean nodal plane solution is similar to the regional stress field from Feb. 1971 to Nov. 1975; 2) About 6 months prior to the main shock up to two days after the shock, the P-axis azimuth changed to 340° and 176°, this was just the same with the P-axis of the main shock; 3) The mean nodal plane solution of small earthquakes before the strong aftershock is similar to that of the aftershock; 4) From 1977 to March, 1980, the contradictory ratio rose to more than 30%. No earthquake of magnitude 5 or above occurred in that region during this period. Finally, the precursory significance of the result obtained in this paper is also discussed.
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