An earthquake took out a section of undersea fiber in Alaska recently, so it has definitely happened before: http://www.adn.com/article/20140725/59-earthquake-

An earthquake took out a section of undersea fiber in Alaska recently, so it has definitely happened before: http://www.adn.com/article/20140725/59-earthquake-causes-telecom-outage-southeast-alaska http://www.adn.com/article/20140725/59-earthquake-causes-tel...