The quick answer is you have to get rid of their food source.
Its normally grubs and earthworms that they are coming up to eat and thus push thru the grass layer., making mounds and trip hazards. Gas bombs and traps really dont work.
Once you knock down the quantity of food avail to them, they will generally move on.
You don't have a mole problem, you have a worm problem.
Just be sure its actual moles and not another animal that your dealing with...lol
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