I live in a generally geographically active area (Southern California, near the San Andreas fault, if that matters), that has had two relatively minor earthquakes that I have felt in the last week (in the 3-4 range on the Richter Scale, I believe), as well as frequently in the past. I am used to this, being born and raised in the region.
I was talking about these phenomena with a colleague who recently moved to the area from a non-earthquake prone place, and was not used to them. I realized that both of the earthquakes were late at night, when I was in bed, and searching my memory I can only recall encountering these minor earthquakes at similar times.
My question, therefore, is if there is any correlation between time of day and earthquakes? Or to put it another way, is my observation based on anything more than the fact that I am more likely to note and recall a minor earthquake what I am not engaged in another activity?