Earth from Space - Image Information

LOCATION Direction Photo #: ISS026-E-17074 Date: Jan. 2011
Geographic Region: CHAD

Emi Koussi Volcano, Chad

Note: This caption refers to the image versions labeled "NASA's Earth Observatory web site".

The broad Emi Koussi volcano is a shield volcano located in northern Chad, at the southeastern end of the Tibesti Range. The dark volcanic rocks of the volcano provide a sharp contrast to the underlying tan and light brown sandstone exposed to the west, south, and east (image lower left, lower right, and upper right).

Emi Koussi was formed from relatively low viscosity lavas--flowing more like motor oil than toothpaste--and explosively-erupted ignimbrites that produce a characteristic low and broad structure covering a wide area (approximately 60 by 80 kilometers).

This astronaut photograph highlights the entire volcanic structure. At 3,415 meters above sea level, Emi Koussi is the highest summit of Africa's Sahara region. The summit includes three calderas formed by powerful eruptions. Two older and overlapping calderas form a depression approximately 12 kilometers by 15 kilometers in area bounded by a distinct rim (image center). The youngest and smallest caldera, Era Kohor, formed as a result of eruptive activity within the past 2 million years.

Young volcanic features, including lava flows and scoria cones are also thought to be less than 2 million years old. There are no historical records of eruptions at Emi Koussi, but there is an active thermal area on the southern flank of the volcano.

Images: All Available Images Low-Resolution 252k
Mission: ISS026  
Roll - Frame: E - 17074
Geographical Name: CHAD  
Center Lat x Lon: 20.0N x 18.5E
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: 30   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 70  
Nadir to Photo Center Direction: E   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: 1622  
Date: 20110111   YYYYMMDD
Time: 085418   GMT HHMMSS
Nadir Lat: 19.4N  
Latitude of suborbital point of spacecraft
Nadir Lon: 16.8E  
Longitude of suborbital point of spacecraft
Sun Azimuth: 142   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 189   nautical miles
Sun Elevation: 39   Angle in degrees between the horizon and the sun, measured at the nadir point
Water Views:  
Atmosphere Views:  
Man Made Views:  
City Views:  

Photo is not associated with any sequences

Home Page
Home Page
JSC Digital
Image Collection
Earth Science &
Remote Sensing

NASA meatball logo
This service is provided by the International Space Station program and the JSC Earth Science & Remote Sensing Unit, ARES Division, Exploration Integration Science Directorate.
ESRS logo