They are 5.0s because they're further downthe fault than our 6.5s

Scientists make a horrible discovery: The "Big One" is coming in two days, with it, California will sink to the ocean. Their only hope is to rupture a volcano that will displace the earthquake's energy and build a new crust on the surface. But as fore-shocks turn California into chaos, it's a race against time the scientists might not win.