File:Eruption of Villarrica Volcano.jpg
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[edit]DescriptionEruption of Villarrica Volcano.jpg |
English: In the predawn hours of March 3, 2015, one of Chile’s most active volcanoes exploded to life. Thousands of people evacuated from within a 10-kilometer (6-mile) radius of Villarrica.
The Operational Land Imager (OLI) on Landsat 8 acquired the top image on February 22, 2015, prior to the main eruption. The Advanced Land Imager (ALI) on the EO-1 satellite captured the second image on March 5. A large volume of volcanic material ejected during the eruption is apparent on the mountain’s eastern side. Activity at Villarrica had been increasing through much of February, made evident by a rise in seismicity, crater incandescenece, and explosions, according to reports from Chile’s National Geology and Mining Service (SERNAGEOMIN) (posted in English by the Smithsonian Institution’s Global Volcanism Program). A faint layer of ash is apparent on the volcano’s flanks. Just prior to the March 3 eruption, geophysicist Jeffrey Johnson and his family prepared to evacuate their home in Pucón, Chile, about 17 kilometers (11 miles) northwest of the volcano. However, the eruption slowed after just 30 minutes. Johnson watched the fire fountain subside and then resumed his work analyzing low-frequency sounds captured by dozens of microphones placed on and near the mountain. It’s too soon to say what the sounds from the fire fountain and ensuing lahar will reveal. Johnson and students from Boise State are analyzing the data and they continue to monitor the volcano. In the meantime, Johnson provided the photographs above, which show the transformation from unsullied glaciers just before the March 3 eruption (top) to slopes covered with tephra. References Idaho Statesman (2015, March 4) Boise State professor listens to roar of Villarrica volcano in Chile. Accessed March 10, 2015. Boise State Public Radio (2015, March 4) Boise State Professor Gets Firely Wake Up Call When Volcano Erupts in Chile. Accessed March 10, 2015. Smithsonian Institution Global Volcanism Program (2015) Villarrica. Accessed March 10, 2015. NASA Earth Observatory images by Jesse Allen, using EO-1 ALI data provided courtesy of the NASA EO-1 team and Landsat data from the U.S. Geological Survey. Photographs by Jeffrey Johnson, Boise State. Caption by Kathryn Hansen. |
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Source | http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=85465 |
Author | Nasa |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ![]() |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SX260 HS |
Exposure time | 1/1,250 sec (0.0008) |
F-number | f/5.6 |
ISO speed rating | 160 |
Date and time of data generation | 02:28, 17 February 2015 |
Lens focal length | 26.448 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 02:28, 17 February 2015 |
Exif version | 2.3 |
Date and time of digitizing | 02:28, 17 February 2015 |
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APEX aperture | 4.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 4.65625 APEX (f/5.02) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
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Focal plane resolution unit | inches |
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Custom image processing | Normal process |
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White balance | Auto white balance |
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