GOES-U, the fourth and final satellite in NOAA's GOES-R Series, recently completed acoustics testing as part of a rigorous testing program to ensure it can withstand the harsh conditions of launch and orbiting in space 22,236 ...
Space Exploration
Mar 31, 2023
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67
Not one but two volcanoes on the same island in Alaska's Aleutian chain were rocked by earthquakes on Friday, prompting concerns about a possible eruption.
Environment
Mar 11, 2023
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28
A swarm of earthquakes occurring over the past few weeks has intensified at a remote Alaska volcano dormant for over a century, a possible indication of an impending eruption.
Environment
Mar 9, 2023
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9
Mars displays fascinating geology everywhere you lookâand nowhere is this more true than in the fractured, wrinkled ground seen in this image from ESA's Mars Express.
Planetary Sciences
Jan 31, 2023
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43
One year ago, the Hunga Tonga-Hunga Ha'apai volcano erupted, causing widespread destruction to the Pacific Island Nation of Tonga, spewing volcanic material up to 58 km into the atmosphere. It brought a nearly 15 m tsunami ...
Earth Sciences
Jan 16, 2023
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84
How have Rome's ancient aqueducts and architectural marvels such as the Pantheon, which features the world's largest unreinforced concrete dome, endured the test of time?
Materials Science
Jan 9, 2023
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95
A volcano in the Andes in Chile's north rumbled to life early Saturday, triggering minor earth tremors and sending a plume of smoke and ash 6,000 meters (nearly 20,000 feet) into a clear sky.
Environment
Dec 11, 2022
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78
Thousands of villagers living near Indonesia's Mount Semeru were racing for refuge Sunday to the wail of emergency sirens as lava snaked towards their homes under a black sky after the volcano erupted.
Environment
Dec 4, 2022
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21
The world's largest volcano oozed rivers of glowing lava Wednesday, drawing thousands of awestruck viewers who jammed a Hawaii highway that could soon be covered by the flow.
Environment
Dec 1, 2022
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20
A deadly volcanic eruption near Tonga in January was the largest ever recorded with modern equipment, a New Zealand-led team of scientists revealed Monday.
Earth Sciences
Nov 21, 2022
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287
Volcanic ash consists of small tephra, which are bits of pulverized rock and glass created by volcanic eruptions, less than 2 millimetres (0.079 in) in diameter. There are three mechanisms of volcanic ash formation: gas release under decompression causing magmatic eruptions; thermal contraction from chilling on contact with water causing phreatomagmatic eruptions and ejection of entrained particles during steam eruptions causing phreatic eruptions. The violent nature of volcanic eruptions involving steam results in the magma and solid rock surrounding the vent being torn into particles of clay to sand size. Volcanic ash can lead to breathing problems, malfunctions in machinery, and from more severe eruptions, years of global cooling.
Ash deposited on the ground after an eruption is known as ashfall deposit. Significant accumulations of ashfall can lead to the immediate destruction of most of the local ecosystem, as well the collapse of roofs on man-made structures. Over time, ashfall can lead to the creation of fertile soils. Ashfall can also become cemented together to form a solid rock called tuff. Over geologic time, the ejection of large quantities of ash can produce an ash cone.
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