Explosive fire lit up on the Caspian Sea caused by a mud volcano

An explosive jet of fire, believed to be caused by a mud volcano, lit up the Caspian Sea on Sunday(4 July, 2021), according to a report by the APA, an Azerbaijani press agency. 
This was initially reported at 9:30 p.m. local time, on the 4th of July, 2021. 

The fire occurred about 6 miles (about 10 kilometers), from the Umid gas field, south of Baku, the Azerbaijani capital. The State Oil Company of Azerbaijan Republic (SOCAR), told the APA, none of its oil platforms were affected by the incident. No injuries have been reported.

Azerbaijani seismologist, Gurban Yetirmishli, suggests, the fire is indicative of a mud volcano. This region is home to hundreds of mud volcanoes. This may be the Makarov Bank mud volcano, which did exactly this in 1958.

A mud volcano is exactly as the name suggests: a volcano that erupts with muddy fluids, rather than lava. They're not exactly real volcanoes.

They are caused by water being heated deep within the Earth, and mixing with rocks and minerals, to create a slurry, that is then forced up to the surface via fissures or cracks. 

Mud volcanoes, can also be plumbed into active hydrocarbon systems, and so they can erupt oil and natural gas, as well as mud.

The reason for ignition is most likely, the sparks from all the rocks in the mud getting banged together, as they are violently erupted.  It can also be the rapid pressure change, that can ignite the gas.

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