It is about three days after a full moon.Most occur then or after a new moon.
There's no earthquake/moon phase correlation, though people desperately seem to want to believe there is one.
There's a new or full moon twice every 28 days. If you start counting 3 days on either side of a new or full moon as "hits" then you're counting 12 days out of 28, or almost half the month.
Most occur then or after a new moon.
The Earth's fractured crust is pulled on by the moon and the sun. Sometimes the gravitational pulls work together and sometimes in opposition, and all that is in conjunction with the crust bulging out at the equator due to centrifugal force. All these conflicting forces work the fracture lines and play games with the tides. It takes a tide chart or computer program to know what the tides are going to be doing at any place at any time.