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Two major earthquakes in Mexico this month have served as a reminder to Californians.

It’s just a matter of time.

Seismologists say California is due for a major earthquake within the next few decades. One nightmare scenario predicts roughly 1,800 people killed.

Some steps have been taken to prepare. After the Loma Prieta and Northridge earthquakes, billions of dollars were spent to fortify structures across the state.

But more than a decade after development began on an earthquake early warning system, the project is still years away from full implementation.