Per the Kathavatthu 7.7, it is not. But, what about the CT tradition in general?
I assume you are speaking of the earth quakes.
Generally, the weather is not due to kamma.
However there is time and place kamma. It is mentioned in the workings of kamma by ven Pa-Auk Sayadawgyi, which is a great resource on how kamma works.
Thank you, Venerable. No, I just mean land in general, like the Kathavatthu speaks about in 7.7. Where in the commentaries does it specify that land, and weather, are not the result of kamma?