I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
If the slide was not from your property, but from the property below yours, and you have a sufficient retaining system in place to prevent your property from sliding, then you have no legal obligation related to your neighbor's property, nor do you have the legal right to control what your neighbor does, or does not do, no his property if it does not effect your property.
In other-words, if the problem is not emanating from your property, but form property belonging to another, you cannot be held liable for the slide, nor the failure of another property owner to correct dangerous conditions. The violation citation you were issued would seem to be relatively simple to defend if the facts are as you claim them to be.
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I wish you and yours the best in 2016,