Featured Research

from universities, journals, and other organizations

Dormant Volcanoes Shows Signs Of Life

Date:
April 16, 2002
Source:
NASA/Jet Propulsion Laboratory
Summary:
Previously dormant volcanoes in two widely separated areas of the Pacific "ring of fire" are showing signs of life, as documented by new images taken by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (Aster) on NASA's Terra satellite.

Previously dormant volcanoes in two widely separated areas of the Pacific "ring of fire" are showing signs of life, as documented by new images taken by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (Aster) on NASA's Terra satellite.

The images are available at:

http://www.jpl.nasa.gov/images/earth/volcano/index.html

Geologists had previously considered Chiliques, a simple 5,778-meter (18,957-foot) stratovolcano with a 500-meter (1,640-foot)-diameter circular summit crater in northern Chile, to be dormant. However, a January 6, 2002 nighttime thermal infrared image from Aster found a hot spot in the summit crater, as well as several others along the upper flanks of the volcano's edifice, indicating new volcanic activity. Examination of an earlier nighttime thermal infrared image from May 24, 2000 showed no such hot spots.

Stratovolcanoes such as Chiliques account for approximately 60 percent of Earth's volcanoes. They are marked by eruptions of cooler, stickier lavas such as andesite, dacite and rhyolite. Because these lavas tend to plug up volcanic plumbing, gas pressures can more easily build up to high levels, often resulting in explosive eruptions. They are typically made up of about half lava and half loose or fragmented rock ejected from the volcano, and are therefore also commonly known as composite volcanoes. Mount Saint Helens in Washington and Mount Pinatubo in the Philippines are examples of stratovolcanoes.

The daytime image of Chiliques was acquired on November 19, 2000 and was created by displaying Aster bands 1, 2 and 3 in blue, green and red. The nighttime image is a color-coded display of a single thermal infrared band. The hottest areas are white, and colder areas are darker shades of red. Both images cover an area of 7.5 by 7.5 kilometers (4.7 by 4.7 miles), and are centered at 23.6 degrees south latitude, 67.6 degrees west longitude.

Meanwhile, a couple of thousand miles to the northwest, a 10-by-20-kilometer (6.2- by-12.4-mile) section of ground near one of the long-dormant Three Sisters volcanoes in the Cascade Mountains of west-central Oregon has risen approximately 10 centimeters (3.94 inches) since 1996. According to the U.S. Geological Survey, this indicates the slow flow of magma or underground lava into the area. A simulated natural color image from Aster has been draped over digital topography from the U.S. Geological Survey National Elevation Dataset to create this new perspective view of Three Sisters.

The Three Sisters area -- which contains five volcanoes -- is only about 273.6 kilometers (170 miles) from Mount St. Helens, which erupted in 1980. Both are part of the Cascades Range, a line of 27 volcanoes stretching from British Columbia in Canada to northern California.

With its 14 spectral bands from the visible to the thermal infrared wavelength region, and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), Aster will image Earth for the next six years to map and monitor the changing surface of our planet.

Aster is one of five Earth-observing instruments on Terra, and is its only high- resolution imaging sensor. Japan's Ministry of Economy, Trade and Industry built the instrument. JPL is responsible for the American side of the joint U.S.-Japan science team that is validating and calibrating the instrument and data products.

Aster's broad spectral coverage and high spectral resolution will provide scientists in numerous disciplines with critical information for surface mapping, and monitoring dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; evaluating wetlands; monitoring thermal pollution; monitoring coral reef degradation; mapping soil and geology surface temperatures; and measuring surface heat balance.

More information on Aster is available at:

http://asterweb.jpl.nasa.gov .

NASA's Earth Science Enterprise is a long-term research and technology program designed to examine Earth's land, oceans, atmosphere, ice and life as a total integrated system.

JPL is a division of the California Institute of Technology in Pasadena.


Story Source:

The above story is based on materials provided by NASA/Jet Propulsion Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

NASA/Jet Propulsion Laboratory. "Dormant Volcanoes Shows Signs Of Life." ScienceDaily. ScienceDaily, 16 April 2002. <www.sciencedaily.com/releases/2002/04/020416074351.htm>.
NASA/Jet Propulsion Laboratory. (2002, April 16). Dormant Volcanoes Shows Signs Of Life. ScienceDaily. Retrieved August 29, 2014 from www.sciencedaily.com/releases/2002/04/020416074351.htm
NASA/Jet Propulsion Laboratory. "Dormant Volcanoes Shows Signs Of Life." ScienceDaily. www.sciencedaily.com/releases/2002/04/020416074351.htm (accessed August 29, 2014).

Share This




More Earth & Climate News

Friday, August 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Volcano Erupts on Papua New Guinea

Raw: Volcano Erupts on Papua New Guinea

AP (Aug. 29, 2014) Several communities were evacuated and some international flights were diverted on Friday after one of the most active volcanos in the region erupts. (Aug. 29) Video provided by AP
Powered by NewsLook.com
Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Scientists Have Figured Out Why Rocks Move In Death Valley

Scientists Have Figured Out Why Rocks Move In Death Valley

Newsy (Aug. 28, 2014) The mystery of the moving rocks in Death Valley, California, has finally been solved. Scientists are pointing to a combo of water, ice and wind. Video provided by Newsy
Powered by NewsLook.com
Big Waves, Minor Flooding from Hurricane

Big Waves, Minor Flooding from Hurricane

AP (Aug. 27, 2014) Thundering surf spawned by Hurricane Marie pounded the Southern California coast Wednesday, causing minor flooding in a low-lying beach town. High surf warnings were posted for Los Angeles County south through Orange County. (Aug. 27) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins