Why are earthquakes destructive for distant cities on basins?

Earthquakes can shake cities far away because basins act like giant bath tubs that catch and push waves.

Imagine you're in a big bathtub full of water. When someone jumps in, the water ripples out, and it keeps going, even to the other end of the tub. Now think of a city on a basin as being in that bathtub: when an earthquake happens nearby, shaking waves travel through the ground, just like ripples in water.

Basins are soft and deep, kind of like a marshmallow bed for the shaking. The waves move slower here, so they don’t stop quickly. This is why cities far away can still feel the earthquake, even if it started miles from them.

It's like when you're in a room and someone claps, you hear it right away. But if that clap happens in another building, and there’s a big empty hallway between you and them, the sound takes longer to reach you, but it still comes. That's what basins do: they help shaking waves travel farther and stay stronger for longer.

So even though the earthquake is far away, cities on basins can feel like they're in the middle of a shaking bath!