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“All the other pipeline accidents that I have looked at have been very localized,” he said. “This one is a mystery to me. Why you have so many houses in such a dispersed area? I have not seen anything of this magnitude.”

The most common causes of gas pipeline explosions, he said, are leaks caused by age and corrosion that catch a spark, or construction workers accidentally striking a pipe.

But because of the series of explosions and fires, Mr. Meshkati said a “cascading effect” might have occurred, where one event causes more.

He said investigators should pay special attention to the mechanisms that were used to transfer gas from high-pressure pipelines to low-pressure pipelines. In 2005, a house exploded in Lexington, Mass., when a KeySpan Energy worker unwittingly connected a high-pressure gas line to a low-pressure line.

Read the full article here>>https://www.nytimes.com/2018/09/14/us/massachusetts-gas-explosions-fires.html

....opinion : age, Mother Nature, neglect and $$$$

Humans? In opposed to what? Aliens? Of course man is responsible in some way, shape or form. Quite the accident I would say.....