Aftershock because aftershock is caused by a secondary quake. The primary quake causes destruction and then it creates more shaking which causes further damage, etc. This will cause many other problems such as broken buildings, roads, landslides, etc., so this would be called an aftershock.
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Aftershock because aftershock is caused by a secondary quake. The primary quake causes destruction and then it creates more shaking which causes further damage, etc. This will cause many other problems such as broken buildings, roads, landslides, etc., so this would be called an aftershock.