Something you rarely get to see is right -- McNamara captured the exact moment a plume of hot ash exploded from the top of the mountain. A visible shockwave races across the water toward his boat and through the sky above, appearing as a cloud racing through the atmosphere. An unidentified bystander yells, "Holy smokin' toledos!" as the shockwave hits the camera.
The area surrounding Tavurvur has a long record of volcanic activity, reports NASA's Earth Observatory, which classified this eruption as "modest" by historical standards. The column of ash and gas ultimately reached a height of 60,000 feet, covering much of the island.
source: huffingtonpost.com By Ryan Grenoble