Volcanoes
Alyssa Barrundia, a missionary living in Guatemala, captured the spectacle at Volcan de Agua in the south of the Central American country on Friday.
Ms Barrundia said it was the second time in the past few weeks the striking spectacle had occurred at the volcano, but the first time she had witnessed it personally.
"It was quite spectacular," she told PA.
Another high-level eruption took place at Ulawun volcano at 10:30 UTC, Aug 03. It follows the ejection to 63,000 feet (19.2km) on June 26 which was the world's first full-scale subplinian eruption since Calbuco, Chile in 2015, which ranked as a VEI 4.
A repeat of that June 26 eruption has just taken place (Aug 03), firing another colossal ash column to 63,000 feet (19.2 km) a.s.l. and comfortably into the stratosphere, according to the Volcanic Ash Advisory Center (VAAC) Darwin,
Particulates ejected to altitudes above 32,800 feet (10 km) have a direct cooling effect on the planet.
This large eruption was preceded by two smaller, though still significant puffs, on Aug 03 — one to 25,000 feet (7.6 km) and the other to 50,000 feet (15.2km). While two powerful ejections have occurred since the 'big one' — both to an estimated 45,000 feet (13.7 km) a.s.l.
This latest eruptive activity looks set to be at least as big as 2000's eruption, which ranked as a VEI 4.
Satellite imagery shows a large circular cloud over the volcano:

In this Thursday, Aug. 1, 2019, aerial photo, a small pond of green water is seen at the lowest point of Kilauea volcano's Halemaʻumaʻu Crater in Hawaii Volcanoes National Park in Hawaii. The discovery is the first time water has been observed in the Big Island crater in recorded history. When lava interacts with water it can cause explosive eruptions, but scientists say it's too soon to know if the pond will cause a violent reaction.
After a week of questions about a mysterious green patch at the bottom of the volcano's Halemaumau crater, the former home of a famed lava lake, researchers confirmed the presence of water on Thursday, officials with the U.S. Geological Survey told The Associated Press on Friday.
"The question is what does this mean in the evolution of the volcano?" USGS scientist emeritus Don Swanson said.
Halemaumau has never had water since written observations began, he said, so the pond is unusual.
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About half of them consisted in small to moderate, but passive ash venting, while the others were explosions that generated ash plumes of typically 1-2 km height and drifting / slowly dissipating rather long distances (few tens of km) mostly towards the NW.
The agency's systems also recorded 5 moderate explosions on Tuesday.
These last two emitted incandescent fragments on the northeast slope.
Klyuchevskoy, the tallest active volcano in Eurasia, located in Kamchatka, in the Russian Far East, has spewed ash as high as 5.5 km above sea level, the Kamchatka Volcanic Eruption Response Team (KVERT) said on Thursday.
"On August 1, the Klyuchevskoy volcano belched ash. The column of ash rose 5,500 meters above sea level.
The ash cloud spread nearly 10 km to the south of the volcano," KVERT said.
The volcano erupted at 12:48 p.m. Jakarta time (0548 GMT), spewing a column of ash up to 0.8 km into the air. The volcanic ash tended to spread to the northeast and east of the crater.
There were no immediate reports of injuries. It was the latest in a series of small-scale eruptions at the volcano in Kumamoto Prefecture since April. No volcanic cinders were detected but the agency warned of volcanic gas.
The agency raised Mt. Aso's volcanic alert level to 2 on a scale of 1 to 5 in April, urging people not to approach the crater. Local municipalities have restricted entry to areas within 1 kilometer of the crater.

The eruption of the Icelandic volcano Hekla may have led to the collapse of multiple thriving Bronze Age societies.
The Storegga Slides
Until about 8,000 years ago, the British Isles were a peninsula, joined to mainland Europe by a strip of chalk downs, swamps, lakes and wooded hills. Today, we call this submerged world Doggerland.
Today, fishermen routinely bring up carved bone and antler tools from the Mesolithic hunter-gatherers who lived here. But by the end of the 7th millennium BC, a warming world caused sea levels to rise. The people of Doggerland must have watched with dread as their villages were swallowed up one by one. But one event would turn the slow advance of the sea into an apocalyptic terror.
The edge of the Norwegian continental shelf is an underwater cliff that runs for six hundred miles along the Atlantic Basin. And one autumn day around 6225-6170 BCE, this cliff collapsed. An estimated 770 cubic miles, or over 50 Mount Everests, of rock broke off and slid into the deep ocean. The rubble flow reached a speed of 90 mph underwater.












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