Satellite Spies Volcano, Could Warn of Eruption
A spectacular volcanic eruption in Indonesia has killed three people and forced mass evacuations, disrupting long-haul flights and closing international airports on Friday. Mount Kelud, considered one of the most dangerous volcanoes on the main island of Java, spewed red-hot ash and rocks high into the air late Thursday night just hours after its alert status was raised.Learn more about volcanoes in our Volcano Explorer
Villagers in eastern Java described the terror of volcanic materials raining down on their homes, while AFP correspondents at the scene saw residents covered in grey dust fleeing in cars and on motorbikes towards evacuation centers. Some of Java's Buddhist temples, such as Prambanan Temple, above, were closed as volcanic ash from Mount Kelud rained down on them.
U.S. Geological Survey
The 1,731-meter (5,712-foot) Mount Kelud has claimed more than 15,000 lives since 1500, including around 10,000 deaths in a massive eruption in 1568. It is one of 130 active volcanoes in Indonesia, which sits on the Pacific Ring of Fire, a belt of seismic activity running around the basin of the Pacific Ocean. Earlier this month, another volcano, Mount Sinabung on western Sumatra island, unleashed an enormous eruption that left at least 16 dead and has been erupting almost daily since September.
Some 200,000 people were ordered to evacuate, though some families ignored the orders and others have returned home, with just over 75,000 now in temporary shelters, National Disaster Mitigation Agency Spokesman Sutopo Purwo Nugroho told AFP.
Nugroho confirmed that ash and pumice were still raining down on villages within a radius of 15 kilometers (9 miles) from the volcano on Friday, but said that some activities were resuming "as normal."
The ash has blanketed eastern Javanese cities, forcing seven airports to close, including those in Surabaya, Yogyakarta, Solo, Semarang and Bandung, which serve international flights, officials said, while grounded planes were seen covered in the dust. "All flights to those airports have been cancelled, and other flights, including some between Australia and Indonesia, have been rerouted," Transport Ministry director general of aviation Herry Bakti said, adding it was "too dangerous to fly" near the plume.
Italian scientists have successfully used data from an orbiting satellite six miles above the Earth to measure the temperature, thickness and volume of the lava in a fiery lake inside the 11,400-foot summit of the Nyiragongo volcano at in the Democratic Republic of Congo. They say the technique could be used to monitor volcanoes in remote spots across the planet.
The researchers, from the National Institute of Geophysics and Volcanology in Catania, Italy, compared data collected from space by Meteosat, a weather satellite operated by a European research consortium.
The information was collected by an instrument called the Spinning Enhanced Visible and InfraRed Imager (SEVIRI), and it matched the results from data collected by a ground-based thermal camera.Their methods are detailed in this article in the Journal of Geophysical Research.
The lava temperature inside Nyiragongo’s lake can reach 2,200 degrees Fahrenheit.
The researchers previously used the same method in 2011 to measure the temperature of a lava fountain inside Mount Etna in Italy, but this was the first time the Congolese volcano had been measured from space. The ability to monitor Nyiragongo and spot an eruption early is important because the city of Goma and its million inhabitants are just 7.5 miles away.
Amazingly, intrepid researchers actually have climbed the volcano and visited the lava lake. Back in 1960, documentary filmmaker Haroun Tazieff made a a documentary, The Devil’s Blast, that revealed for the first time the glowing inferno. In 2010, the summit was visited by a team that included photographer Olivier Grunewald, who got to within a few feet of the lake to take these close-up images.
Photo: The lava lake bubbling inside Nyiragongo. Credit: Cai Tjeenk Willink, via Wikimedia Commons.