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Post by B on Dec 3, 2010 8:04:43 GMT -5
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Post by iameye on May 15, 2012 8:38:23 GMT -5
Rise and fall of underwater volcano revealed By David Shukman Science editor, BBC News Professor Watts said: "Any movement on the seabed has the potential to create a tsunami. An earthquake suddenly dislocates the seabed. Here a violent disturbance lasted five days with magma oozing out which might be too slow to trigger a tsunami - but it's unknown. "This is a violent exchange of rock into the water - it could destabilise the cone and cause a landslide which in principle could cause a tsunami. The same expedition's survey produced stunning images last year of a line of underwater volcanoes being carried inexorably to the chasm of a subduction zone, the Tonga Trench. That research was investigating whether the volcanoes exacerbated or dampened the pressures on the fault line. www.bbc.co.uk/news/science-environment-18040658 |
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Post by iameye on May 15, 2012 8:50:30 GMT -5
SNAP! Is this the type of situation we should worry about, or not? SNAP-27
SNAP-27 on the Moon.
Five SNAP-27 units provided electric power for the Apollo Lunar Surface Experiment Packages (ALSEP) left on the Moon by Apollo 12, 14, 15, 16, and 17. The fuel capsule, containing 3.8 kilograms (8.4 pounds) of plutonium-238 in oxide form (44,500 Ci or 1.65 PBq), was carried to the Moon in a separate fuel cask attached to the side of the Lunar Module. The fuel cask provided thermal insulation and added structural support to the fuel capsule. On the Moon, the Lunar Module pilot removed the fuel capsule from the cask and inserted it in the RTG.
These stations transmitted information about moonquakes and meteor impacts, lunar magnetic and gravitational fields, the Moon's internal temperature, and the Moon's atmosphere for several years after the missions. After ten years, a SNAP-27 still produced more than 90% of its initial output of 70 watts.
The fuel cask from the SNAP-27 unit carried by the Apollo 13 mission currently lies in 20,000 feet (6,500 m) of water at the bottom of the Tonga Trench in the Pacific Ocean. This mission failed to land on the moon, and the lunar module carrying its generator burnt up during re-entry into the Earth's atmosphere, with the trajectory arranged so that the cask would land in the trench. The cask survived re-entry, as it was designed to do,[9] and no release of plutonium has been detected. The corrosion resistant materials of the capsule are expected to contain it for 10 half-lives (870 years).[/color] en.wikipedia.org/wiki/Systems_for_Nuclear_Auxiliary_Power  |
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Post by iameye on May 15, 2012 9:04:06 GMT -5
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Post by iameye on May 15, 2012 11:14:04 GMT -5
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