I’m trying to make something similar to Natural Disaster Survival however I’m unsure of how to make the destruction effects on the maps. I know it has something to do with breaking joints but I’m not sure how it’s done. If anyone knows please let me know.
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Its actually pretty simple. Make each building out of many different parts. Then lets just say your disaster comes into a certain radius of each part, it unanchors the part and then you can manipulate it however you want.
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Oh yeah but sometimes unanchoring won’t be noticable without some sort of force being applied. Any ideas on how to do add force to a group of parts? like a tornade or tsunami.
I would weld all the parts together with weld constraints. Then when you want to break the building, just use :Destroy on the welds. 
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Use welds.
You can also use https://create.roblox.com/docs/reference/engine/classes/BasePart#GetConnectedParts
To unanchor/destroy any welds that arent welded to the baseplate anymore
Okay I did this and it worked. However if I destroy the bottom half of a building with a tsunami, the top half stays up because it’s anchored. Therefore I need to use welds or something, if I use a weld script the parts would randomly be welded to eachother and they won’t weld to the ones nearest them. So how would I tackle this?
just if a chunk of building is higher than a removed chunk, unanchor it.
Is there a way to weld the parts without having to manually do it?
You could try using a nested loop and go thrgh every part thats touching another part and weld them together?