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5 December 2013 11:26 am ,
Vol. 342 ,
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
- 5 December 2013 11:26 am , Vol. 342 , #6163
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ScienceShot: Express Elevator From Hell
31 July 2013 2:45 pm
Molten rock spewing forth in volcanic eruptions may have risen dozens of kilometers through Earth’s crust in a few months rather than over millennia, a new study suggests. When researchers looked at crystals of the mineral olivine (inset) extracted from lavas erupted from Costa Rica’s Irazú volcano during a 2-year eruption that began in 1963, they found that about 15% contained thin layers with higher-than-normal concentrations of nickel, an element found more commonly in Earth’s mantle than in the overlying crust. The chemical composition of each successive layer represents the environmental conditions that the growing olivine crystals experienced as they rose toward Earth’s surface, and the fact that nickel hadn’t diffused evenly throughout the mineral indicates that crystal-filled magma had risen from the mantle in a short period of time. Indeed, the scientists estimate that those layered crystals had risen through the estimated 35 kilometers of crust below Irazú volcano in as little as 4 months, they report online today in Nature. On average, though, magma migrated upward at about 80 meters per day, or more than 3 meters per hour, the team notes. It’s also in the same range of speeds seen beneath other peaks where networks of seismic instruments have detected deep earthquakes associated with the rapid movement of magma. But alas, deep quakes beneath a volcano may not serve as an infallible sign of an impending blowout (as seen in Italy’s Stromboli volcano, main image), the scientists say: Some peaks with deep quakes didn’t end up erupting, and many that did erupt didn’t show seismic signs of deep magma movement. For now, the signals that betray when and whether a peak will erupt remain elusive.