California’s Earthquake Warning System A Work In Progress

SACRAMENTO (CBS13) — When Thursday’s 5.3-magnitude earthquake struck off the Ventura Coast, researchers at Cal Tech got a very early warning.
But why didn’t everyone in the state hear the same loud siren as they did in Mexico when last year’s massive earthquake struck?
The simple answer is state officials are developing California’s “Shake Alert System” with caution.
“Because we sit on the edge of the Pacific plate,” said state geologist John