Transcription: Earthquakes are expected in San Francisco. It is built on a fault line in the Earth's crust. The land is slowly moving. Scientists monitor earthquake activity, but they can hit suddenly. These security cameras captured the quake of 1989. It shakes the building's foundations. Some fall. The streets and bridges crack apart. And while people struggle with collapsing houses, fires break out as electric cables snap and gas pipes break, adding to the destruction.
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