Experts believe another huge earthquake in California is inevitable
About five million people in California have taken part in the biggest earthquake drill in US history.
Schools, hospitals and staff working in public buildings all responded to the simulated tremor at exactly the same time.
Children donned fake blood to act as victims, while fire-fighters with chainsaws and rescue gear rushed to the scene of a burning building with artificial smoke billowing from its windows.
The drill was designed to alert people in the state to the threat of a potentially catastrophic earthquake. Scientists believe a quake with a magnitude of at least 7.0 will happen within the next 30 years.
The locals, the state and the federal government came together very quickly, unlike what we have seen at [Hurricane] Katrina
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