evidence: Before-and-after satellite images give an idea of the scale of destruction in the towns and cities across the affected regions in Turkey. Drag to the right below to see how entire buildings in Islahiye have collapsed. [Handout: Maxar Technology via Reuters] Since February 6, Turkey has been hit by more than 100 aftershocks of magnitude 4 and greater. Aftershocks are smaller earthquakes that occur in the same general area after a big earthquake. [...] Turkey is in one of the world’s most active earthquake zones. Monday’s 7.8 magnitude earthquake is the most powerful to hit the country since 1999.