Is Carbon Dioxide storing safe?

Imagine, you are in Iceland, where boffins are going to start storing carbon dioxide in basalt, thereby converting it into limestone. Out of the blue, a strong earthquake which is as powerful as the earthquake which triggered the Fukishima tsunami, which is 9 on the Richter scale, strikes a top secret facility where Carbon Dioxide is being stored. Probably, the limestone would release all the bonded CO2 gas. Or the limestone would get into cracks within the Earth's surface, which would probably result in the basalt meting  away and the Carbon dioxide gas being vapourized. All of these would wreak havoc in the Earth's atmosphere. Is this also a doomsday prediction???

A World Coal Institute Diagram depicting Carbon Storage