Flat earth…

Is it flat? Is it a globe? So, if it’s a globe we have tectonic plates moving and causes different actions around the globe. Like vulcano erruptions and earthquakes. But if it’s flat we don’t have any tectonic movements at all so what makes the earthquakes then? Hint: usa has a station in Antarctica with a device wich can make earthquakes! Christchurch in New Zealand experienced this the day they started the device!