Immediately after an earthquake, the danger of fire or explosion from a broken natural gas line can be a real worry for survivors. It's important to know the difference between a gas meter that's functioning normally and one that's connected to a broken line.

In a Facebook post Monday, an official from Enstar shows the sights and sounds to understand:

The official says a low hissing sound is normal for a meter that's consuming natural gas.

The time to shut the gas off right away is when there's a loud screaming sound and the meter's dial is spinning faster than usual.

Watch the full demonstration in the video above.

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