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The earth is flat but it's extremely thick. See, when we take photos, due to an illusion we end up seeing the earth round. Because the earth is in space, and we're not, our eyes and brains aren't adjusted to comprehend planets and stars as flat. See, even the asteroids are roundish flat, reason because they're not big. Due to an illusion, we end up seeing the earth along with other stars as flat. Yes, we can go under the thick flat surface, and yes earthquakes do exist.The surface is flat, but plate tectonics happen underground so that it can maintain the ground and life on it. Which is why earthquakes happen, because plate tectonics are underground.
The earth is really flat and it's thickness make the earth look like a rectangle.