Why are there fault lines near Santorini, and can they cause a tsunami?

The Santorini earthquake swarm continues northeast of the island, and experts are increasingly confident that this is a seismic event unrelated to any volcanic activity. What is unknown is whether the earthquake swarm could lead to a larger earthquake. Big earthquakes on the type of faults near Santorini can cause tsunamis if the quake and associated movement of the seabed are large enough. The chance of this happening is low, but a tsunami in the area could be a significant event. This video talks about why there are fault lines near Santorini, what the earthquakes represent, and how the movement that generates earthquakes can produce a tsunami in locations like this where the earth's crust is stretching.