00:00What if the catastrophic earthquake California's been fearing
00:03is actually two disasters in one?
00:06Scientists now believe that the infamous big one
00:09could be just half the nightmare.
00:11New research reveals that a massive quake
00:13in the Cascadia subduction zone
00:15could trigger another one on the San Andreas Fault.
00:18And the scary part? They might strike just minutes apart.
00:21This could stretch emergency services beyond their limits
00:24and put cities like San Francisco, Portland, Seattle,
00:27and even Vancouver in grave danger.
00:29The Cascadia zone, which runs from Northern California to Canada,
00:33has a history of magnitude nine quakes.
00:36The last one?
00:37In the year 1700, powerful enough to launch a tsunami that reached Japan,
00:42scientists found at least 18 historic quakes on Cascadia,
00:45followed by rumbles on the San Andreas.
00:48That means this isn't just theory. It's already happened.
00:51One quake alone could kill thousands.
00:53But two? That's a full-blown national crisis.
00:56And with both fault lines long overdue,
00:59the clock might already be ticking.
01:01Experts say, prepare now.
01:03Have a plan. A disaster kit.
01:05And if the shaking starts, head east fast.
01:07Because when the big one hits, it might not come alone.
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