"A Stupendously Huge Raft of Volcanic Rock Has Floated Across The Ocean to Australia 20 AUGUST 2020
A gigantic fleet of floating rocks, spewed up from an underwater volcano in the Pacific Ocean, floated across the waves for thousands of miles. Eventually, it made it all the way to Australia, then started on a new project: revitalising the world's largest (and very threatened) coral reef system.
This unlikely chain of events may sound somewhat incredible, but it's an entirely true story – one that has played out dramatically over the last year, while highlighting the surprising, largely unseen ways in which Earth's natural environmental systems intersect with one another.
Stranger still, it's not the first time this has happened. An eruption in 2001 from the same submarine seamount – a nameless volcano, simply dubbed Volcano F or 0403-091, located near the Vavaʻu islands in Tonga – produced a similar rocky flotilla, which also voyaged on the currents to Australia over the space of a year.
When this phenomenon occurs, it creates what's called a pumice raft – a floating platform composed of countless chunks of buoyant and highly porous volcanic rock."
"Grímsvötn: Iceland’s most active volcano may be about to erupt
The ice-covered Grímsvötn volcano on Iceland produced an unusually large and powerful eruption in 2011, sending ash 20km into the atmosphere, causing the cancellation of about 900 passenger flights. In comparison, the much smaller 2010 eruption of Eyjafjallajökull led to the cancellation of about 100,000 flights.
Understandably, any mention of another explosive eruption from an Icelandic volcano will raise concerns in the air travel industry, which is currently reeling from the COVID-19 pandemic. But there are clear signs that the Grímsvötn volcano is getting ready to erupt again. As a result, the authorities have recently raised the threat level for this volcano.
Grímsvötn is a peculiar volcano, as it lies almost wholly beneath ice, and the only permanently visible part is an old ridge on its south side which forms the edge of a large crater (a caldera). And it is along the base of this ridge, under the ice, that most recent eruptions have occurred. "
Not possible to stop so many planes at this moment, is that a silver lining. Imagine how many live the lockdown may save if there is an eruption.
Well the global aviation industry is being targeted in particular by the blunt quarantine regulations. As you well know in NZ, Air New Zealand has gone from a growing international airline to a domestic airline with even the flights to West Island limited.
"The rules are simple: They lie to us. We know they are lying. They know we know they are lying, but they keep lying to us and we keep pretending to believe them."
This fits the thread title so I will put it here......
"Asteroid Apophis Could Still Hit Earth in 2068, New Measurements Suggest
Only a small handful of objects are known to pose a serious threat to Earth, and the gigantic asteroid Apophis is one of them. Scientists are now re-evaluating its potential to strike our planet in 48 years, owing to improved observations of the problematic asteroid.
Observations made earlier this year from the Subaru Telescope in Hawai’i are providing astronomers with a better sense of how the Yarkovsky effect is influencing the orbital path of asteroid 99942 Apophis. This effect is like a built-in propulsion system for asteroids, in which trace amounts of leaking radiation can alter an object’s momentum in space, causing it to drift ever-so-slightly from the path otherwise chosen by gravity.
“Without taking Yarkovsky drift into account, Apophis is still a threatening object, just not in 2068,” Dave Tholen, a researcher from the Institute for Astronomy at the University of Hawai’i and a co-author of the pending study, explained in an email. “With Yarkovsky taken into account, the 2068 impact scenario is still in play. Small, but non-zero.”
Tholen, along with Davide Farnocchia from NASA’s Jet Propulsion Laboratory, crunched the new numbers, finding that Yarkovsky acceleration is keeping the Apophis threat inside the 2068 window. Their findings are laid out in new research presented at the 2020 virtual meeting of the Division for Planetary Sciences of the American Astronomical Society. "