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EARTH OBSERVATION
Chilean Volcano Plume Moving Around the World
by Staff Writers
Greenbelt MD (SPX) Jun 16, 2011


The MODIS instrument on NASA's Terra satellite captured this visible image of the ash plume from the eruption of the Puyehue-Cordon Caulle volcano, Chile on June 13 at 14:35 UTC (10:35 a.m. EDT). The wind shifted from the day before and was now blowing from the west and southwest, pushing the plume east and northeast. Note the snow on the Andes Mountain rage. Image Credit: NASA Goddard/MODIS Rapid Response, Jeff Schmaltz/Text: NASA/Rob Gutro

Since its eruption in early June, several NASA satellites have captured images of the ash plume from the eruption of the Chilean Volcano called Puyehue-Cordon Caulle and have tracked it around the world. NASA has collected them in the NASA Goddard FLICKR image gallery that shows the progression of the plume around the southern hemisphere.

The Puyehue-Cordon Caulle Volcanic Complex includes the Puyehue volcano, the Cordon Caulle rift zone and the Cordillera Nevada caldera.

One of the instruments that provided daily imagery of the ash plume is called the Moderate Resolution Imaging Spectroradiometer (MODIS) that flies on both NASA's Aqua and Terra satellites. Other satellites have provided images and animations of the plume such as the GOES-11 satellite, which is operated by NOAA and whose images and animations are created by the NASA GOES Project at NASA's Goddard Space Flight Center in Greenbelt, Md.

The new NASA Goddard FLICKR image gallery contains a series of MODIS images from the day the Puyehue volcano erupted on June 4 to June 14.The images are shown in date order in the gallery and show the ash plume circling the southern hemisphere.

The image gallery focuses on the data from the MODIS instrument on Aqua and Terra to provide continuity and ease of identification of the ash plume. The plume can appear differently to other NASA satellites that look at the atmosphere using other parts of the spectrum other than visible and infrared light.

The gallery begins on June 4, 2011 when a fissure opened in the Puyehue-Cordon Caulle Volcanic Complex. The MODIS instrument on NASA's Aqua satellite captured a natural-color image that showed the ash 45,000 feet (14,000 meters) high. As the plume shot up and blew southeast toward Argentina, heavier particles fell to the ground. According to the Buenos Aires Herald, the border town of Bariloc, Argentina reported as much as a foot (30 centimeters) of ash on the ground.

In addition to large amounts of ash on the ground in Chile and Argentina, rainfall poses another problem. Chile's National Geology and Mining Service noted that rainfall on loose ash could trigger landslides and lahars, especially in the Andes Mountains where river valleys are clogged with ash.

According to Agence France-Presse, air travel from South America to Australia has been adversely affected. NASA confirmed the ash locations in satellite imagery over New Zealand, South Africa, and Tasmania this week.

On June 10, Aqua's MODIS showed winds pushed the plume east and northeast over Argentina. The next day, winds twisted the ash plume like a pretzel over Argentina. By June 12, Terra's MODIS instrument saw the volcano's ash plume blowing over the southwestern tip of South Africa on its way around the world, while Aqua's MODIS captured an image of the volcano that showed its plume being drawn into a low pressure system in the Atlantic Ocean.

The next day, June 13, NASA's Aqua satellite provided an image of the light brown ash plume crossing over New Zealand and Tasmania. Tasmania is an Australian island and state located 150 miles south of Australia.

Later in the day Aqua's MODIS instrument showed the ash plume pouring out of the Puyehue-Cordon Caulle volcano and traveling east and northeast. The height of the plume varied during the day with the intensity of the eruption. Plumes were measured between 2.5 and 5 miles (4 and 8 kilometers) high at different times of the day.

On June 14, NASA satellite imagery from three different overpasses was pieced together by Jeff Schmaltz of the MODIS Rapid Response Team at NASA Goddard. NASA's Aqua satellite overpasses created a mosaic of the volcanic ash plume traversing the South Pacific Ocean.

Meanwhile, MODIS on the Terra satellite captured another look at what was happening at the volcano. At 15:15 UTC (11:15 a.m. EDT), winds continued pushing the plume east and southeast into the Southern Atlantic Ocean. The ash plume was reaching as high as five miles (8 kilometers) into the atmosphere.

As air traffic continues to be affected in Chile, Argentina, southern Brazil, Paraguay, Uruguay, and even Australia, the news from Chile's National Geology and Mining Service was that a possible return to increased eruption activity.

NASA continues to generate daily images of the Puyehue-Cordon Caulle's plume over Chile and the rest of the southern hemisphere. NASA's Earth Observatory, housed at NASA Goddard, posts new images of volcanic eruptions at their Natural Hazards web page here.

For NASA Goddard FLICKR Gallery of images of Puyehue-Cordon Caulle volcano eruption from June 4 to June 14, 2011 please go here.

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