"Is the design concept of this city meant to remind people of the power of natural disasters?"
15 degrees.
In a math problem, that might be a very small incline.
One could even determine the degree with the naked eye without any calculation.
But in the context of an entire city, that's a bit of an exaggeration. Even if the shaking is extremely slow, it can still be compared to an earthquake.
And it would bring a lot of hidden dangers to daily life.
For instance, water glasses on tables must be secured, one must also be fixed in place while dining at a restaurant, and one might constantly slip while showering.
If you're cycling, a steep slope might suddenly become even steeper in an instant.
And the originally manual piston action could completely turn into an automatic one, not needing to do anything and leaving it all to fate.
Sword Without End didn't have any fondness for earthquakes.