How the Pakistan earthquake created a new island

The island that rose from the sea following an earthquake

A new island has emerged off Gwadar in the Arabian Sea after a powerful earthquake struck southwestern Pakistan.

Seismologists suspect the 7.7 magnitude quake created a "mud volcano" - a jet of mud, sand and water - which caused the seabed to rise and create the rare phenomenon.

"Sandy layers underground are shaken, and sand grains jiggle and become more compact," John Armbruster, a seismologist at the Lamont Doherty Earth Observatory at Columbia University told NBC News.

A spokesman for Pakistan's National Disaster Management Authority said: "his is not a permanent structure, just a body of mud. It will disappear over time."

Read: Hundreds dead in Pakistan earthquake

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Second earthquake hits Pakistan

A 6.8 magnitude earthquake has hit south-west Pakistan, in the same region where at least 359 people died in a quake earlier this week.