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  Image: Geographic Location Direction Photo #: ISS030-E-12516 Date: Dec. 2011
Geographic Region: MAURITANIA

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  Richat Structure

The Richat Structure of Mauritania has captured the attention of astronauts for about as long as NASA has sent humans into orbit around Earth. This circular geologic feature is thought to be caused by an uplifted dome geologists would classify it as a domed anticline that has been eroded to expose the originally flat rock layers.

In this type of geologic structure, rocks exposed in the center of the bulls-eye are older than rocks forming the outer rings. This structure measures 45 kilometers (28 miles) across and is made up of igneous and sedimentary rocks. There are several faults visible (lower left) where strata that were once continuous have been shifted apart.

Most of Mauritania lies within the Sahara Desert, where dry climate conditions and periodic droughts create difficult living conditions. Approximately 3.7 million people live in Mauritania, though much of the population lives along its Atlantic coastline, about 500 kilometers (300 miles) from the Richat Structure.

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Images: All Available Images Low-Resolution 481k
Mission: ISS030  
Roll - Frame: E - 12516
Geographical Name: MAURITANIA  
Center Lat x Lon: 21.1N x 11.4W
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
Camera: N2
Camera Tilt: HO   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 400  
Nadir to Photo Center Direction: NE   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number:  
Date: 20111217   YYYYMMDD
Time: 172802   GMT HHMMSS
Nadir Lat: 16.5N  
Latitude of suborbital point of spacecraft
Nadir Lon: 17W  
Longitude of suborbital point of spacecraft
Sun Azimuth: 240   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 219   nautical miles
Sun Elevation: 14   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views: DESERT, FAULT  
Water Views:  
Atmosphere Views:  
Man Made Views:  
City Views:  
Photo is not associated with any sequences

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