Many real estate professionals, like myself, keep a map on the wall with a indicator of every reported sink hole and even those that are unreported but we are aware of. Remember, they only get media attention with they gobble up a house.
A past homebuyer called me yesterday and asked, "Is that why you didn't want me to buy on Robmar?" She is ready to buy another home and will be able to do so with confidence.
It is imporatnt for you to understand, the ONLY real estate that is known be on solid ground are those properties that have undergone remediation. The have a 300 page engineering report to prove it!
Like termites, tropical storms and humidity, sink holes are part of the environment.
Best of success to you.