In general, there is a connection. The earth tides have an amplitude in the tens of centimeters [1] (yes, the earth moves under our feet!) and a connection to e

In general, there is a connection. The earth tides have an amplitude in the tens of centimeters [1] (yes, the earth moves under our feet!) and a connection to earthquakes is a given, since the stress changes on faults can trigger them. Here is one example: [2] Their research also indicates that a higher stress can trigger earthquakes not triggered by lower stress since the local fault strength must be exceeded. [1] https://en.wikipedia.org/wiki/Earth_tide https://en.wikipedia.org/wiki/Earth_tide [2] http://www.pnas.org/content/113/31/8601.abstract http://www.pnas.org/content/113/31/8601.abstract