File:Volcanoes near Usulután, El Salvador.jpg
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editDescriptionVolcanoes near Usulután, El Salvador.jpg |
English: 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 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 2013. The stratovolcano’s steep cone shape and well-developed summit crater are evident, along with dark lava flows. Immediately to the north-west, the truncated summit of Chinameca Volcano (also known as El Pacayal) is marked by a two-kilometre wide caldera. The caldera formed when a powerful eruption emptied the volcano’s magma chamber, causing the chamber’s roof to collapse. Like its neighbour 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. Usulután Volcano is directly south-west of El Tigre. While the flanks of Usulután 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 grey to white regions contrasting with green vegetation and tan fallow agricultural fields—are located in the vicinity of these volcanoes, including the town of Usulután (lower left) and Santiago de María (upper left). |
Date | |
Source | NASA Earth Observatory |
Author | NASA Expedition 23 crew |
Camera location | 13° 24′ 00.1″ N, 88° 17′ 59.9″ W | View this and other nearby images on: OpenStreetMap | 13.400028; -88.299972 |
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This image or video was catalogued by Johnson Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ISS023-E-22411. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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Image acquired with a Nikon D3X digital camera fitted with an effective 340 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center.
Licensing
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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Annotations InfoField | This image is annotated: View the annotations at Commons |
Santiago de Mara
Usulután
El Tigre
Chinameca
San Miguel
Lava flow
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current | 11:10, 26 April 2010 | 4,037 × 3,525 (6.59 MB) | Originalwana (talk | contribs) | {{Information |Description={{en|1=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 o |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Image title | 102 SSC2_No_Folder _33R |
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Camera manufacturer | NIKON CORPORATION |
Camera model | NIKON D3X |
Exposure time | 1/640 sec (0.0015625) |
F-number | f/5.6 |
ISO speed rating | 200 |
Date and time of data generation | 22:29, 31 March 2010 |
Lens focal length | 340 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Microsoft Windows Photo Gallery 6.0.6001.18000 |
File change date and time | 11:55, 26 April 2010 |
Exposure Program | Aperture priority |
Exif version | 2.21 |
Date and time of digitizing | 22:29, 31 March 2010 |
APEX shutter speed | 9.321928 |
APEX aperture | 4.970854 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 33 |
DateTimeOriginal subseconds | 33 |
DateTimeDigitized subseconds | 33 |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 340 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Unique image ID | AC483624D07C4AC2BF6D5AEDFA3F0CEA |