The main solar tide has a period, or repeat time, of 12 hours.
7 hours, is even closer to resonance and overtakes the 12-hour solar tide in importance.
69, page 265), with a table of solar tide
extremes from 1964 through 1990 that closely matches the graph by Olson and Lytle.
Now we also see that tides - the daily lunar and solar tides
- very strongly modulate tremors," he added.
Berkeley's Jeanloz notes that the rotation rate of the entire Earth is slowing as a result of the friction caused by lunar and solar tides
Also, big quakes have never happened at times of big solar tides
Saturn and Mars have a much smaller influence than the Earth-Moon system, while the three outer planets have almost no effect on solar tides