It's an unknown at the moment.
Residents and some officials continue fearing that Crosstex’s butane could cause an explosion. Gas is obviously escaping. The company, backed by DNR and the DEQ, says its cavern poses little to no threat to residents near the sinkhole...................
I say evacuate for at least 2 months while more tests are being carried out.

In this case I would exercise caution and put the people first here.