Analysis for the correlation between the various parameters of earthquakes-5

In Chugoku Area, Correlation between T (Occurrence Time) and D (Depth) in 19set/163set among 11 epicenters are more than 0.9900. The major correlation lines are in the graph below, 

This result with strong  correlations shows that these occurrence times should be not random. It means the occurrence time of earthquake should follow some rule(s) under the specific conditions (gauges), and that the prediction of earthquakes should be possible with the occurrence time if we can know the rule(s). It may be possible by AI analysis for mega database of Japan Meteorological Agency.