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Collection:
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NASA Planetary Photo Journal Collection
Collection
NASA Planetary Photo Journal Collection
Collection
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Title:
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Nabro and Mallahle Volcanoes, Eritrea and Ethiopia, SRTM Colored Height and Shaded Relief
Title
Nabro and Mallahle Volcanoes, Eritrea and Ethiopia, SRTM Colored Height and Shaded Relief
Title
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Original Caption Released with Image:
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The area known as the Afar Triangle is located at the northern end of the East Africa Rift, where it approaches the southeastern end of the Red Sea and the southwestern end of the Gulf of Aden. The East African Rift, the Red Sea, and the Gulf of Aden are all zones where Earth's crust is pulling apart in a process known as crustal spreading. Their three-way meeting is known as a triple junction, and their spreading creates a triangular topographic depression for which the area was named.
Not surprisingly, the topographic effects of crustal spreading are more dramatic in the Afar Triangle than anywhere else upon Earth's landmasses. The spreading is primarily evident as patterns of numerous tension cracks. But some of these cracks provide conduits for magma to rise to the surface to form volcanoes.
Shown here are a few of the volcanoes of the Afar Triangle. The larger two are Nabro Volcano (upper right, in Eritrea) and Mallahle Volcano (lower left, in Ethiopia). Nabro Volcano shows clear evidence of multiple episodes of activity that resulted in a crater in a crater in a crater. Many volcanoes in this area are active, including one nearby that last erupted in 1990.
This image was created directly from an SRTM elevation model. A shade image was derived by computing topographic slope in the north-south direction. Northern slopes appear bright and southern slopes appear dark. The shade image was then combined with a color coding of topographic height, with green at the lower elevations, rising through yellow, orange, and red, up to purple at the highest elevations.
Elevation data used in this image was acquired by the Shuttle Radar Topography Mission (SRTM) aboard the Space Shuttle Endeavour, launched on February 11, 2000. SRTM used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) that flew twice on the Space Shuttle Endeavour in 1994. SRTM was designed to collect three-dimensional measurements of the Earth's surface. To collect the 3-D data, engineers added a 60-meter-long (200-foot) mast, installed additional C-band and X-band antennas, and improved tracking and navigation devices. The mission is a cooperative project between the National Aeronautics and Space Administration (NASA), the National Geospatial-Intellige nce Agency (NGA) of the U.S. Department of Defense (DoD), and the German and Italian space agencies. It is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Earth Science Enterprise, Washington, DC.
Size: 35.2 kilometers (21.8 miles) by 22.5 kilometers (14.0 miles)
Location: 13.3 degrees North latitude, 41.7 degrees East longitude
Orientation: North toward the top
Image Data: Shaded and colored SRTM elevation model
Date Acquired: February 2000
Original_Caption_Rel eased_with_Image
The area known as the Afar Triangle is located at the northern end of the East Africa Rift, where it approaches the southeastern end of the Red Sea and the southwestern end of the Gulf of Aden. The East African Rift, the Red Sea, and the Gulf of Aden are all zones where Earth's crust is pulling apart in a process known as crustal spreading. Their three-way meeting is known as a triple junction, and their spreading creates a triangular topographic depression for which the area was named.
Not surprisingly, the topographic effects of crustal spreading are more dramatic in the Afar Triangle than anywhere else upon Earth's landmasses. The spreading is primarily evident as patterns of numerous tension cracks. But some of these cracks provide conduits for magma to rise to the surface to form volcanoes.
Shown here are a few of the volcanoes of the Afar Triangle. The larger two are Nabro Volcano (upper right, in Eritrea) and Mallahle Volcano (lower left, in Ethiopia). Nabro Volcano shows clear evidence of multiple episodes of activity that resulted in a crater in a crater in a crater. Many volcanoes in this area are active, including one nearby that last erupted in 1990.
This image was created directly from an SRTM elevation model. A shade image was derived by computing topographic slope in the north-south direction. Northern slopes appear bright and southern slopes appear dark. The shade image was then combined with a color coding of topographic height, with green at the lower elevations, rising through yellow, orange, and red, up to purple at the highest elevations.
Elevation data used in this image was acquired by the Shuttle Radar Topography Mission (SRTM) aboard the Space Shuttle Endeavour, launched on February 11, 2000. SRTM used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) that flew twice on the Space Shuttle Endeavour in 1994. SRTM was designed to collect three-dimensional measurements of the Earth's surface. To collect the 3-D data, engineers added a 60-meter-long (200-foot) mast, installed additional C-band and X-band antennas, and improved tracking and navigation devices. The mission is a cooperative project between the National Aeronautics and Space Administration (NASA), the National Geospatial-Intellige nce Agency (NGA) of the U.S. Department of Defense (DoD), and the German and Italian space agencies. It is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Earth Science Enterprise, Washington, DC.
Size: 35.2 kilometers (21.8 miles) by 22.5 kilometers (14.0 miles)
Location: 13.3 degrees North latitude, 41.7 degrees East longitude
Orientation: North toward the top
Image Data: Shaded and colored SRTM elevation model
Date Acquired: February 2000
Original Caption Released with Image
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Image Credit:
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NASA/JPL/NIMA
Image_Credit
NASA/JPL/NIMA
Image Credit
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Produced By:
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JPL
Produced_By
JPL
Produced By
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Mission:
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Shuttle Radar Topography Mission (SRTM)
Mission
Shuttle Radar Topography Mission (SRTM)
Mission
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Spacecraft:
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Space Shuttle Endeavour
Spacecraft
Space Shuttle Endeavour
Spacecraft
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Target Name:
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Earth
Target_Name
Earth
Target Name
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Is a satellite of:
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Sol (our sun)
Is_a_satellite_of
Sol (our sun)
Is a satellite of
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Instrument:
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X-Band Radar
Instrument
X-Band Radar
Instrument
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Instrument:
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C-Band Radar
Instrument
C-Band Radar
Instrument
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Product Size:
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250 samples x 380 lines
Product_Size
250 samples x 380 lines
Product Size
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facet_what:
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Sun
facet_what
Sun
facet_what
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facet_what:
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Crater
facet_what
Crater
facet_what
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facet_what:
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Earth
facet_what
Earth
facet_what
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facet_what:
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C/X-Band Synthetic Aperture Radar
facet_what
C/X-Band Synthetic Aperture Radar
facet_what
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facet_what:
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Spaceborne Imaging Radar
facet_what
Spaceborne Imaging Radar
facet_what
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facet_what:
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Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar
facet_what
Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar
facet_what
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facet_what:
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Space Shuttle Endeavour
facet_what
Space Shuttle Endeavour
facet_what
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facet_what:
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Shuttle Radar Topography Mission
facet_what
Shuttle Radar Topography Mission
facet_what
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facet_what:
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SRTM
facet_what
SRTM
facet_what
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facet_what:
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C-Band Radar
facet_what
C-Band Radar
facet_what
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facet_what:
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X-Band Radar
facet_what
X-Band Radar
facet_what
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facet_what:
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Space Shuttle Orbiter
facet_what
Space Shuttle Orbiter
facet_what
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facet_what:
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Shuttle Radar Topography Mission (SRTM)
facet_what
Shuttle Radar Topography Mission (SRTM)
facet_what
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facet_where:
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Jet Propulsion Laboratory
facet_where
Jet Propulsion Laboratory
facet_where
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facet_where:
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Red Sea
facet_where
Red Sea
facet_where
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facet_where:
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Washington
facet_where
Washington
facet_where
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facet_where:
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Ethiopia
facet_where
Ethiopia
facet_where
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facet_where:
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Eritrea
facet_where
Eritrea
facet_where
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facet_where:
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Gulf of Aden
facet_where
Gulf of Aden
facet_where
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facet_where:
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Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
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facet_when:
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1990
facet_when
1990
facet_when
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facet_when:
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1994
facet_when
1994
facet_when
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facet_when:
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February 2000
facet_when
February 2000
facet_when
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facet_when:
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February 11, 2000
facet_when
February 11, 2000
facet_when
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facet_when_year:
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1990
facet_when_year
1990
facet_when_year
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facet_when_year:
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1994
facet_when_year
1994
facet_when_year
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facet_when_year:
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2000
facet_when_year
2000
facet_when_year
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Image #:
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PIA04953
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UID:
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SPD-PHOTJ-PIA04953
UID
SPD-PHOTJ-PIA04953
UID
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orignial url:
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orignial_url
orignial url
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