Thank all of you for your responses so far.
Black Sheep, it's funny you mentioned tectonic plates because thats the very thing my son was saying and focusing on.
From what coffee_black posted above, it seems this is a naturally occuring thing with oil being sent into the ocean periodically.
I enjoyed that article.
Marvin I must not be understanding what you typed above correctly. Are you suggesting that Earthquakes don't ever leave cracks or holes behind? I understand the part about earthquakes moves ground.
I will quote you then post some pics and tell me what you mean.
Marvin said:
An earthquake moves ground, it does not make and leave behind open holes. The amount of matter involved is far too extensive to allow massive release of deep underground deposits of oil because of an earthquake.
Now look at these pictures and also you can do a google search on "pictures of earthquake cracks" to see more.