Why do earthquakes mostly happen outside of daylight hours?

Since this thread has been brought back from the dead, I want to pop a question that I’ve never been able to find an answer for, despite a fairly good amount of searching. How many people would have been killed if the Northridge quake had happened a few hours later? Has anybody figured out an estimate? IIRC, it was MLK’s Birthday, so the schools were closed, and the Northridge Fashion Plaza would likely have been crowded. I’ve been mildly obsessing over this ever since the quake—how many people would have been killed just at the mall alone?

I can see where OP us coming from. Looking back at the last eight years, most of smaller or mid sized quakes that I have felt in Los Angeles have been during “night”, or more accurately very later at night or very early morning when most people are asleep.

Vast majority of the quakes I have felt since 2008 were while I was asleep. I remember two during the day, both were in 2008. Another was about 6 am, I think 2013 was the year.

I have also not felt any earthquakes any time for the past year(2015), even though there have been tremors here in SoCal. One recent one was in Banning, out in the Inland Empire area.

If the OP used the last eight years to judge by they should have sent that list to everyone so people would be forewarned.

Dang. How come nobody posts histograms on the SDMB anymore? I fell like I’m back in college in the 1990’s and looking at mainframe output.