Undersea City (The Undersea Trilogy, Book 3)

It was the most dreaded of all undersea phenomena. If strong enough, it would set up chain-reaction pressures that could shatter any dome and cost inestimable lives. But the Krakatoan Dome has been specifically designed to cope with the tremors of its seaquake-prone area. The trouble was, all of a sudden, there were more quakes than any of the experts had counted on... quakes that no one could possibly have forecast because they hadn't come from natural causes.