Originally Posted by D

It wasn't that big or that long, really.

But it was the second one that I've felt this month after a long period of not feeling one...

And it's increasing in intensity, so yeah, we could have a big one in the next month or so... or we could go the rest of our lives in SoCal without feeling another one (though I'd doubt that)... not even the most intelligent of seismologists knows the answer... so don't worry about not knowing.

And to answer your heat question... the epicenters of most earthquakes are miles underground... far away from the effects of daily surface temperature changes. It's all in the plate tectonics - and nearly all of the heat energy down there is coming from all the molten rock churning around.

Remember - the Earth's crust (the part we live on) is the coldest part of the Planet... if you were digging a deep hole in the ground, it might get cooler for the first 1000 or so meters you dig down, but after that (less than a mile down) it starts warming up.