Puente Hills fault system could touch off a 7.5 temblor directly beneath downtown. The good news? It might be thousands of years away. Experts: "It's kind of a worst-case scenario for L.A." "This is the fault that could eat L.A." If you're thinking about life extension when you're at the end of your days, you might want to steer clear of the City of Angels. New Quake Threat Found Under LA | 
