A quake lasted 50 days and no one felt it in Turkey. The type of quake is known as “phantom quakes.” This certain type of quake doesn’t release any seismic waves you expect, they don’t produce shaking.

For more info, please read the original article by National Geographic:
https://www.nationalgeographic.com/science/2019/02/earthquake-lasted-50-days-no-one-felt-it-heres-why/