Zalzala Koh
Zalzala Koh or Zalzala Jazeera was a small island off the coast of the port city of Gwadar in Balochistan province of Pakistan which appeared on 24 September 2013 just hours after a powerful earthquake in Balochistan on that day. As predicted by many geologists, the island soon started to submerge, with satellite images indicating the island had sunk into the sea one month after its initial appearance. By the end of 2016, the island had disappeared.
Formation
Zalzala Koh may have been a mud volcano, located in the Arabian Sea offshore of Gwadar in Balochistan, Pakistan. It rose out of the water during a 7.7-magnitude earthquake that struck the same province on 24 September 2013.Ali Rashid Tabriz, the head of Pakistan's National Institute of Oceanography, said that the surfacing of the island had been caused by an emission of methane gas on the seabed.