The Gwadar Mud Volcano

On September 24, 2013, an earthquake of 7.7 on the Richter scale shook the sea floor near Pakistan. A few hours later, there was a new island in the sea.

The oval-shaped, 91-meter (300 ft) island came seemingly out of nowhere, but that was just the beginning—the island also emits flammable gas, making it dangerous to explore. It was created by the sudden appearance of a mud volcano, a type volcano that spews hot mud instead of ordinary lava. 

Since the volcano was on the ocean floor, the mud was soon cooled by the water and formed an island. The scientists are still trying to work out the true nature of the phenomenon—some experts think there may be other volcanic or tectonic activities involved—but the locals have a ready explanation. 

According to them, a similar island called Zalzala Koh (Quake Hill) existed 60 or 70 years ago. Zalzala Koh eventually disappeared into the ocean, but now they say the earthquake has finally brought it back.