Despite the older technology, JIMS also uses a triggering system.

CNN: High-tech highway cops get the full scoop on criminals

Echoing her husband's comments, Preston blamed chemicals in household cleaners and pesticides for attacking her son's immune system, triggering the condition.

CNN: Actors' son Jett Travolta dies at 16

This dissipation often causes stresses to accumulate elsewhere in the fault system, triggering tremors far from the place where the rocks first slipped.

ECONOMIST: Nature rarely repeats itself

How well governments manage to trim their public sectors, without triggering an explosion, may depend on elusive factors like trust in the political system.

ECONOMIST: Strikes and unions