| The Kamchatka Peninsula, Russia | |
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| Tweet Topic Started: May 16 2011, 11:26 AM (279 Views) | |
| Mark (IWO) | May 16 2011, 11:26 AM Post #1 |
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The Kamchatka Peninsula of Russia, located along the Pacific “ring of fire,” includes more than 100 volcanoes. While most of these volcanoes are not actively erupting, many are considered dangerous due to their eruptive history and their proximity to population centers and air travel corridors. This astronaut photograph highlights the summit crater and snow-covered slopes of the Avachinsky stratovolcano as it pokes above a surrounding cloud deck. ![]() The 2,741 meter (8,993 foot) high Avachinsky volcano has an extensive historical and geological record of eruptions. The latest activity occurred in 2008. Avachinsky Volcano from the ground. Image wiki.The large city of Petropavlovsk, Kamchatka, is located approximately 25 kilometers (15 miles) to the southwest and is built over approximately 30,000–40,000 year old debris deposits from an avalanche that originated at Avachinsky—suggesting that the city may be at risk from a similar hazard in the future. To the southeast (image right), the large breached crater of Kozelsky Volcano is also visible above the clouds. Kozelsky is a parasitic cone, formed by the eruption of material from vents along the flank of Avachinsky. The topography of the volcanoes is accentuated by shadows caused by the relatively low sun angle, and by the oblique viewing angle. Oblique images are taken looking outwards from the International Space Station, rather than the “straight down” (or nadir) view typical of most Earth-observing sensors. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption by William L. Stefanov, NASA-JSC. Instrument: ISS - Digital Camera |
| The coldest winter you will ever experience is a summer in West Clare. | |
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| Mark (IWO) | February 7 2012, 01:25 PM Post #2 |
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![]() A thick lava flow has been creeping down the eastern slopes of Kizimen Volcano since its current eruption began in December 2010. The flow has advanced about 600 meters (2,000 feet) since September 2011. Unlike the fluid lava commonly found on Hawaii’s Kilauea, Kizimen’s lava is extremely viscous, virtually solid. This type of “blocky” flow advances as chunks of hardened lava tumble from the front of the flow. The falling blocks expose the hot interior of the flow, visible as red (relatively cool), orange, and yellow (relatively hot) pixels in this satellite image. Dark debris (material that has fallen from the surface of the lava flow) blankets the entire eastern side of the volcano. It is fresh enough to remain uncovered by snow, despite the ongoing Russian winter. Downwind of the volcano, ash on snow is lighter brown. This false-color image was acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard Terra on February 2, 2012. The gas and steam plume rising from Kizimen’s summit is white, as is snow. Surrounding forests (visible in the large image) are rust colored. Image by Jesse Allen and Robert Simmon, using data from the NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team. Caption by Robert Simmon, with help from Erik Klemetti, Eruptions. Instrument: Terra - ASTER |
| The coldest winter you will ever experience is a summer in West Clare. | |
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| Mark (IWO) | February 13 2012, 12:14 PM Post #3 |
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![]() Slow growth of a lava dome characterizes the current eruption of Russia’s Shiveluch Volcano. Lava domes are formed by magma that is too thick to form lava flows, so instead it builds a rounded mound. According to Denison University volcanologist Erik Klemetti, eruption rates also play a role, with low rates of lava extrusion likely to create lava domes and higher rates favoring formation of lava flows. (The expansion of the lava dome on Mount St. Helens from 2003–04 illustrates how lava domes grow from within.) This false-color satellite image of Shiveluch was collected by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard Terra on February 2, 2012. The dome itself is shrouded in a plume of steam and other volcanic gases. Light brown ash covers snow downwind of the lava dome, towards the southeast. The northern slopes of Shiveluch are in deep shadow, and the surrounding forests are red/brown. NASA image by Jesse Allen and Robert Simmon, with data from the NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team. Caption by Robert Simmon. Instrument: Terra - ASTER |
| The coldest winter you will ever experience is a summer in West Clare. | |
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2:09 AM Jul 11