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Nevado del Ruiz, a broad, glacier-covered stratovolcano in Colombia, South America, most known for its eruption in 1985 that killed ~25,000 people, has seen recent volcanic activity over the past few weeks. INGEOMINAS, the Colombian goelogical survey is heavily monitoring the volcano in the case of a future eruption. Since March 27th, there have been tremors associated with fluid motion (likely magma), seismic activity and rock fracturing, as well as earthquakes and high SO2 emissions. Above is an image of a small steam plume from the volcano as seen on March 27, 2012. Image from INGEOMINAS Colombia.
Satellite image courtesy of AVO/USGS.
This satellite radar image is of Mount Cleveland stratovolcano that is located 940 miles southwest of Anchorage on Chuginadak Island in the Aleutian Islands. The image was collected on February 10, 2012 and shows a small lava dome in the volcano's summit crater. The summit crater is about 200 meters across. Recently, the volcano had a brief explosion on March 7th and another on March 9th, both of which likely produced some airborne ash, according to volcanologists. The eruptions may have also removed or partially removed the lava dome that was growing within the summit crater (seen in image above).