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Mud Volcaones
There are many mud volcanoes on the island, near oil reserves in southern parts of the island of Trinidad. On August 15, 2007, the Moruga Bouffle mud volcano was said to be emitting methane gas. This was a sign that it is definitely active.

The Formation of Mud Volcanoes

A mud volcano is a fierce eruption of watered-down mud or clay. This mixture contains methane gas. (Gas bubbles can be seen in the mud which builds up at the mouth of the conically shaped structure). The explosive methane gas originates from organic matter in shales or from secondary accumulations in sand stringers within the source-rock shale or from larger reservoirs just above or just below such shales. The source of a mud volcano is a wide-ranging layer, below the surface or a plume of loose, unconsolidated mud or shale. The forces accountable for a mud volcano happen because of the weight of rock overload caused by the fluid content of unconsolidated shales.

There are also several other mud volcanoes in the tropical island which include:

the Devils Woodyard mud volcano near Hindustan
the Moruga Bouffe mud volcano near Moruga
the Piparo mud volcano
the Chatham mud volcano located underwater in the Columbus Channel; this mud volcano periodically produces a short-lived island.

Devil's Woodyard

Piparo

Palo Seco

Anglais Point

Digity

Chatham