Will you help me look up some information on the earthquake that hit OK City (and us) on Friday and Saturday?

The first one at 2a.m on Sat morning, which I didn’t feel because I was in bed, was a 4.5. The second one Saturday night, which I did feel because I was up, was a 5.6.

My son wants to know if the one Sat night was another earthquake or an after shock. I told him they both originated from the same fault, and that an ‘aftershock’ and ‘another earthquake’ are basically the same thing. But that makes me wonder, why do they call it ‘after shocks?’

Also, he wanted to know if it was an S wave or a P wave, and the type of fault that slipped.

My computer is SO slow and hangs up all of the time that I can’t seem to get anywhere, so I need some help please.

And, while we’re at it, how do I set Google as my home page? Everything changed recently, I can’t find my “Internet Options” feature, and my home page defaults to “Ask.com” which is worthless.