Caught on cam: Boaters flee volcanic ash cloud | CTV News
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Caught on cam: Boaters flee volcanic ash cloud | CTV News
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When a volcano erupts, pyroclastic flows are often the biggest danger to anyone nearby. These fast-flowing currents of rock, ash and hot gas are extremely difficult to study, so researchers created their own. Read the related Nature Geoscience paper here: https://go.nature.com/2Im1bYs | Nature Portfolio
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When a volcano erupts, pyroclastic flows are often the biggest dange…
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Pyroclastic flows from Unzen were generated by gravitational collapse of the growing lava dome, near the city of Shimabara, Nagasaki (1991). Most of the flows traveled from 1 to 3 km, but some flows reached more than 4 km, burning houses and killing people in the evacuated zone of Kita-kamikoba on the eastern foot of the volcano.The velocities of the flows ranged from 15 to 25 m/s on the gentle middle flank. Scientific paper: http://link.springer.com/article/10.1007/BF00301514#page-1 Other detai
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When molten rock is inside the earth, it’s called magma, but as soon as it erupts from a volcanic vent, it becomes lava. Lavas like basalt can flow like a red-hot river, while dacite and rhyolite lavas can ooze slowly out of the volcano to form a lava dome. Some lavas can flow faster than a person can run, but normally lava travels slowly enough for people to move out of its way. Everything in the path of an advancing flow can be knocked over, surrounded, burned or buried. Scientists are able to
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Pyroclastic flows (referred to more often today, as pyroclastic density currents) are rapidly moving avalanches of hot rock, dust and gas that flow down the sides of a volcano. What makes them especially devastating is that they are extremely hot and can travel for several miles from a volcano. They can form during an eruption when hot pulverized rock and gas that first rapidly rises into the sky falls back, forming pyroclastic flows that race down the sides of the volcano. Other times, pyroclas
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