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  Image: Geographic Location Direction Photo #: ISS023-E-22411 Date: Mar. 2010
Geographic Region: EL SALVADOR
Feature: SAN MIGUEL VOLCANO, CHINAMECA VOLCANO, EL TIGRE VOLCANO, USULUTAN VOLCANO

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  View Low-Resolution Image  
  Volcanoes near Usulutan, El Salvador

The Pacific coastline of much of Central America is marked by a line of active and quiescent volcanoes known to geologists as the Central American Volcanic Arc. The volcanoes result from the upward movement of magma generated along the subduction zone between the Cocos and Caribbean tectonic plates. Frequent earthquakes also occur along the plate boundary. This astronaut photograph includes four stratovolcanoes--a type of volcano common in active subduction zones--in El Salvador, near the midpoint of the Central American Volcanic Arc.

While all of the volcanoes shown here have been active during the Holocene Epoch (from about 10,000 years ago to the present), only the 2,130-meter- (6,990-foot-) high San Miguel (also known as Chaparrastique) has been active during historical times. The most recent activity of San Miguel was a minor gas and ash emission in 2002. The stratovolcano's steep cone shape and well-developed summit crater are evident, along with dark lava flows. Immediately to the northwest, the truncated summit of Chinameca Volcano (also known as El Pacayal) is marked by a two-kilometer- (one-mile-) wide caldera. The caldera formed when a powerful eruption emptied the volcano's magma chamber, causing the chamber's roof to collapse. Like its neighbor San Miguel, Chinameca's slopes host coffee plantations.

Moving to the west, the eroded cone of El Tigre Volcano is visible. El Tigre formed during the Pleistocene Epoch (1.8 million to about 10,000 years ago), and it is likely the oldest of the stratovolcanoes in the image. Usulutan Volcano is directly southwest of El Tigre. While the flanks of Usulutan have been dissected by streams, the mountain still retains a summit crater that is breached on the eastern side. Several urban areas--recognizable as light gray to white regions contrasting with green vegetation and tan fallow agricultural fields--are located in the vicinity of these volcanoes, including the town of Usulutan (lower left) and Santiago de Mara (upper left).
 
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Images: All Available Images Low-Resolution 290k
Mission: ISS023  
Roll - Frame: E - 22411
Geographical Name: EL SALVADOR  
Features: SAN MIGUEL VOLCANO, CHINAMECA VOLCANO, EL TIGRE VOLCANO, USULUTAN VOLCANO  
Center Lat x Lon: 13.4N x 88.3W
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
 
Camera: N4
 
Camera Tilt: 33   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 340  
 
Nadir to Photo Center Direction: N   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: 1129  
 
Date: 20100331   YYYYMMDD
Time: 222927   GMT HHMMSS
Nadir Lat: 11.4N  
Latitude of suborbital point of spacecraft
Nadir Lon: 88.5W  
Longitude of suborbital point of spacecraft
Sun Azimuth: 270   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 185   nautical miles
Sun Elevation: 23   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views: CALDERA, CRATER, VOLCANO  
Water Views:  
Atmosphere Views:  
Man Made Views:  
City Views: USULUTAN, SANTIAGO DE MARA  
Photo is not associated with any sequences


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