If earthquakes are produced by stress, the radiation patterns fo. them must be the quadrant type. But many observed radiation pat terns are not quadrant, but conical type. This points to the fac'that earthquakes are not produced by stress.
If earthquakes are produced by stress, earthquakes which havl the same radiation patterns ought to cause the same faults (topo graphical changes). But, in practice, the radiation patterns are no in agreement with faults (topographical changes). To show this, thl author took up the Toonankai earthquake of December 7,1944 an the Nankaido earthquake of December 21,1946.
If earthquakes are produced by stress, their momentum should bl conserved at any initial time. But, in many of actual earthquakes their momentum is not conserved, as is seen in the Fukui earthquake of June 28,1948.
The Mag m a Explosion theory of earthquakes reconciles these con tradictions.
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