Mucciarelli i periodi esaminati sono diversi, anzi.... sono proprio 2 cose diverse.
I cinesi intitolano:
18.6Years SEISMIC CYCLE AND THE PRELIMINARY EXPLORATION FOR ITS CAUSE
Divlding the seismically most active parts over the world into 13 study regions and analysing statistically the correlations between large earthquakes(1897-1990)in each region and the 18.6a lunar nodal period, it has been found that the events in all major seismic regions have a significant 18.6a seismic cycle consisting of an active period of 12.4a and a quiet period of 6.2a.
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