I have seen several different lighting strikes. One example was a 4inh main in a local town. Lighting struck a near by tree and blew the pipe out of the ground according to the gas company they get calls like this every a couple of years.
Another one was lighting struck the ground about half way between a house and a propane tank that was 50 feet away. I remember you could see a burn pattern on the ground. With this one the lighting entered the house and blew the main breaker actually bunt it and started a small fire where the gas line entered the house. The strange thing about this one when the contractors dug up the copper gas line there where pin size holes in the line from the strike location to the house. And the line from the strike location to the tank looked fine.