Question

What does an aftershock indicate ?

Answer 1

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$\mathfrak{\blue{Answer.}}$ An aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. ... In some earthquakes the main rupture happens in two or more steps, resulting in multiple main shocks.
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Answer 2

Explanation:

An aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. ... In some earthquakes the main rupture happens in two or more steps, resulting in multiple main shocks.