Word: caldera
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...live along Montana's Yellowstone River are downstream from a simmering caldera, a geologic hot spot that has become especially active recently. Indeed, Yellowstone National Park contains the floor of a gigantic volcanic cauldron, one that rises and sinks with the forces that lie beneath - hence the picturesque geysers and steam holes. But a wave of recent earthquake activity is raising fears that have their origins 642,000 years ago, when a Yellowstone "supervolcano" exploded so violently that it created the caldera itself. Today, such an explosion - 1,000 times more powerful than the explosion of Mount St. Helens...
...activity relaxed in magnitude early this week but then flexed upward again to top 3.0 by early New Year's Eve. "This December 2008 earthquake sequence is the most intense in this area for some years," YVO reported, "and is centered on the east side of the Yellowstone Caldera," the ancient collapsed volcano beneath Yellowstone Lake. The scientists said they cannot immediately "identify any causative fault or other feature without further analysis." (See a gallery of recent volcanic eruptions...
...destruction is total. At the eruption's epicenter - known to workers at the site as the Big Hole - a 100-ft. (30 m) plume of white smoke billows into the sky, obscuring the sun and spreading the sulfurous odor of rotting eggs. On a narrow causeway leading to the caldera, dozens of trucks idle in a queue, waiting to deliver soil for the massive earthworks meant to contain the mud. Already, they have transported more than 88 million cu. ft. (2.5 million cu m) of dirt to build eight miles (13 km) of levees around the site. Dozens of cranes...
...project was abandoned last March when a new government team took over management of the site. More recently, a Japanese team proposed building a 130-ft.-high (40 m high) dam to contain the mud. Scientists familiar with Lusi have dismissed that idea. Because the ground beneath the caldera is still sinking, a heavy concrete dam would likely rupture...
...Cristina Narbona, seated in the audience Saturday, was impressed with Stiglitz's discussion of education as a key stimulus for economic growth. "To hear him say that gives us incentive to improve our proposals even more." And in a speech closing Saturday's meeting, Labor Minister Jesús Caldera responded to Caldicott's impassioned critique of nuclear energy by promising to take Spain's remaining eight reactors out of service "when they reach the end of their useful lives...