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解説
English: Volcano Popocatepetl, a large strato volcano located approximately 70 kilometers southeast of Mexico City, is considered by many volcanologists to be “the planet’s riskiest volcano.” The volcano warrants this distinction because of how close it is to one of the most densely populated mega cities on Earth: near 23 million people lived in Mexico City in 2009. The variety of potential volcanic hazards at Popocatepetl is also considerable, including explosive eruptions of ash, pyroclastic flows (hot, fluid avalanches of rock fragments and gas), and debris avalanches.

This detailed astronaut photograph of the summit crater of Popocatepetl (image center) also highlights Ventorillo and Noroccidental Glaciers. Together with the ice on nearby Iztaccíhuatl Volcano and Pico de Orizaba (Mexico’s highest peak and the highest volcano in North America), Popocatepetl’s glaciers are the only mountain glaciers in tropical North America. The glaciers create yet another volcanic hazard: dangerous mudflows, or lahars, if the ice were to melt during an eruption. At the time this image was taken, steam and ash plumes were observed at the volcano. A faint white steam plume is visible against gray ash deposits on the eastern and southern flanks of the volcano.


International Space Station InsigniaISS Crew Earth Observations: ISS018-E-28898International Space Station Insignia
Identification
Mission ISS018 (Expedition 18)
Roll E
Frame 28898
Country or Geographic Name MEXICO
Features POPOCATEPETL VOLCANO, SUMMIT CRATER
Center Point Latitude 19.0° N
Center Point Longitude -98.6° E
Camera
Camera Tilt 22°
Camera Focal Length 800 mm
Camera Nikon D2Xs
Film 4288 x 2848 pixel CMOS sensor, RGBG imager color filter.
Quality
Percentage of Cloud Cover 0-10%
Nadir What is Nadir?
Date 2009-02-07
Time 15:05:24
Nadir Point Latitude 19.7° N
Nadir Point Longitude -97.5° E
Nadir to Photo Center Direction Southwest
Sun Azimuth 119°
Spacecraft Altitude 189 nautical miles (350 km)
Sun Elevation Angle 26°
Orbit Number 2557
日付 acquired February 7, 2009
原典 http://earthobservatory.nasa.gov/IOTD/view.php?id=37589&src=iotdrss
作者 Astronaut photograph ISS018-E-28898 was acquired on February 7, 2009, with a Nikon D2Xs digital camera fitted with an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and the Image Science & Analysis Laboratory, Johnson Space Center. The image was taken by the Expedition 18 crew. The image in this article has been cropped and enhanced to improve contrast. Lens artifacts have been removed. The International Space Station Program supports the laboratory to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption William L. Stefanov, NASA-JSC.
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Public domain このファイルはアメリカ航空宇宙局(NASA)によって作成されたものです。NASAの著作権の方針では、特記事項が無い場合、NASAの資料はパブリックドメインとなります。
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現在の版2009年3月23日 (月) 07:282009年3月23日 (月) 07:28時点における版のサムネイル1,440 × 956 (552キロバイト)Shizhao{{Information |Description={{en|1=Volcan Popocatepetl, a large stratovolcano located approximately 70 kilometers southeast of Mexico City, is considered by many volcanologists to be “the planet’s riskiest volcano.” The volcano warrants this distinct

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