Currently located just north of Niland, the mud pot is moving toward Union Pacific Railroad tracks and giving engineers there a headache. A well dug to depressurize the source of the gas had no effect. Steel walls driven 80 feet into the ground were also nonchalantly circumvented; the mud pot simply ducked under them and continued its freakishly linear path of destruction. “No one has seen a moving mud pot before,” says David Lynch, a consulting physicist who has long studied the area’s geothermal features. Mud pots and mud volcanoes also generally don’t emit much water, but this one is extremely vigorous, producing somewhere around 40,000 gallons of water a day. Lynch and other experts have taken to calling it a “mud spring.”
via https://www.nationalgeographic.com/science/2018/11/bubbling-pool-mud-moving-california-dont-know-why-geology/