Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

Scientists Find Possible Second Subglacial Impact Crater in Northwest Greenland
Sci-News.com ^ | Feb 12, 2019 | News Staff / Source

Posted on 02/12/2019 2:54:00 PM PST by ETL

Following the discovery of the 19.2-mile wide Hiawatha impact crater beneath the northwest margin of the Greenland Ice Sheet, Dr. Joe MacGregor of NASA’s Goddard Space Flight Center and colleagues explored satellite and aerogeophysical data in search of additional such craters and found a possible second impact crater that is 22.7 miles wide and 114 miles southeast of the Hiawatha crater.

The discovery is described in a paper in the journal Geophysical Research Letters. ..."

Following the finding of that first crater, Dr. MacGregor and co-authors checked topographic maps of the rock beneath Greenland’s ice for signs of other craters.

Using imagery of the ice surface from NASA’s Terra and Aqua satellites, they soon noticed a circular pattern some 114 miles to the southeast of Hiawatha Glacier. The same circular pattern also showed up in ArcticDEM, a high-resolution digital elevation model of the entire Arctic derived from commercial satellite imagery.

To confirm their suspicion about the possible presence of a second impact crater, the researchers studied the raw radar images that are used to map the topography of the bedrock beneath the ice, including those collected by NASA’s Operation IceBridge.

What they saw under the ice were several distinctive features of a complex impact crater: a flat, bowl-shaped depression in the bedrock that was surrounded by an elevated rim and centrally located peaks, which form when the crater floor equilibrates post-impact.

(Excerpt) Read more at sci-news.com ...


TOPICS: Astronomy; Chit/Chat; History; Science
KEYWORDS: arcticdem; astronomy; catastrophism; clovis; clovisimpact; glaciation; godsgravesglyphs; greenland; hiawathaglacier; holocene; impact; joemacgregor; megafauna; nasa; pleistocene; science; youngerdryas
Navigation: use the links below to view more comments.
first 1-2021-23 next last

Just 114 miles from the recently-discovered Hiawatha impact crater under the ice of northwest Greenland, lies a possible
second impact crater. The 22.7-mile-wide feature would be the second crater found under an ice sheet, and if confirmed,
would be the 22nd-largest crater on Earth. Image credit: NASA’s Goddard Space Flight Center / Jefferson Beck
1 posted on 02/12/2019 2:54:00 PM PST by ETL
[ Post Reply | Private Reply | View Replies]

To: ETL

Trump’s fault.

If not his fault, then Bush’s fault.


2 posted on 02/12/2019 2:54:56 PM PST by Ancesthntr ("The right to buy weapons is the right to be free." A. E. van Vogt, The Weapons Shops of Isher)
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL

Let me guess and it’s growing really fast.


3 posted on 02/12/2019 2:55:23 PM PST by Gahanna Bob
[ Post Reply | Private Reply | To 1 | View Replies]

To: Gahanna Bob

” Hiawatha impact crater “ Do they mean ‘lie-a-watha’ in reference to princess running beaver?


4 posted on 02/12/2019 3:03:33 PM PST by rktman ( #My2ndAmend! ----- Enlisted in the Navy in '67 to protect folks rights to strip my rights. WTH?)
[ Post Reply | Private Reply | To 3 | View Replies]

To: ETL

That’s where I dropped it!


5 posted on 02/12/2019 3:04:17 PM PST by DannyTN
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL

meteor impacts that titled the earth and caused the Flood?


6 posted on 02/12/2019 3:22:01 PM PST by CondorFlight
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL

aerogeophysical - they just made that up


7 posted on 02/12/2019 3:33:29 PM PST by NativeSon ( Grease the floor with Crisco when I dance the Disco)
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL

We live in a great celestial shooting gallery. We are the target.


8 posted on 02/12/2019 3:42:34 PM PST by Don Corleone (Nothing makes the delusional more furious than truth.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL; SunkenCiv; Ernest_at_the_Beach

Could be, certainly could be a second impact crater.


9 posted on 02/12/2019 3:46:44 PM PST by Robert A Cook PE (The democrats' national goal: One world social-communism under one world religion: Atheistic Islam.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL

Can this one be Pocahontas?


10 posted on 02/12/2019 3:49:36 PM PST by Vermont Lt
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL

Fist named Bada
Second named Bing


11 posted on 02/12/2019 3:54:46 PM PST by minnesota_bound
[ Post Reply | Private Reply | To 1 | View Replies]

To: ETL

19.2 and 22.7 miles wide... I can’t even begin to imagine what damage those two meteorites would do to whatever was living on earth, way back then.


12 posted on 02/12/2019 3:57:29 PM PST by carriage_hill (A society grows great when old men plant trees, in whose shade they know they will never sit.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: carriage_hill

Considering the Chicxulub (suspected dinosaur killer 65mya) impact was by a body somewhere between 7 and 50 KM diameter, and said impactor’s crater is over 150 kilometres (93 miles) in diameter...

I doubt that it was more than a couple of bad years weather for the rest of the planet. For those in the immediate area, however, it was likely pretty ugly for a long while!


13 posted on 02/12/2019 4:21:00 PM PST by Don W (When blacks riot, neighbourhoods and cities burn. When whites riot, nations and continents burn.)
[ Post Reply | Private Reply | To 12 | View Replies]

To: Robert A Cook PE; 75thOVI; Abathar; agrace; aimhigh; Alice in Wonderland; AnalogReigns; AndrewC; ...
Thanks Robert A Cook PE.

14 posted on 02/12/2019 4:24:22 PM PST by SunkenCiv (and btw -- https://www.gofundme.com/for-rotator-cuff-repair-surgery)
[ Post Reply | Private Reply | To 9 | View Replies]

To: carriage_hill
19.2 and 22.7 miles wide... I can’t even begin to imagine what damage those two meteorites would do to whatever was living on earth, way back then.

It's nothing compared to the Existential Threat of man-made global warming:

Amy Klobuchar Declares That Global Warming is An "Existential Threat"

World Bank ups funds to tackle 'existential threat' of climate change ($200B!)

15 posted on 02/12/2019 4:27:18 PM PST by Steely Tom ([Seth Rich] == [the Democrat's John Dean])
[ Post Reply | Private Reply | To 12 | View Replies]

To: StayAt HomeMother; Ernest_at_the_Beach; 1ofmanyfree; 21twelve; 24Karet; 2ndDivisionVet; 31R1O; ...
Thanks Robert A Cook PE for the ping, and thanks ETL for the topic.

16 posted on 02/12/2019 4:35:58 PM PST by SunkenCiv (and btw -- https://www.gofundme.com/for-rotator-cuff-repair-surgery)
[ Post Reply | Private Reply | To 9 | View Replies]

To: Steely Tom

Amy’s an “Existential Idiot”.


17 posted on 02/12/2019 6:26:33 PM PST by carriage_hill (A society grows great when old men plant trees, in whose shade they know they will never sit.)
[ Post Reply | Private Reply | To 15 | View Replies]

To: Ancesthntr

#2. It’s nobody’s FAULT. It is a crater. There is a difference.

A “fault” is what is going to do justice to the commies in California when it takes SF and LA into the Mariannas Trench, for ever.


18 posted on 02/12/2019 8:08:43 PM PST by MadMax, the Grinning Reaper (with)
[ Post Reply | Private Reply | To 2 | View Replies]

To: MadMax, the Grinning Reaper

My comment just went right over your head.

It is their fault because everything in the world that is bad must be the fault of some hated Republican President.


19 posted on 02/12/2019 11:25:08 PM PST by Ancesthntr ("The right to buy weapons is the right to be free." A. E. van Vogt, The Weapons Shops of Isher)
[ Post Reply | Private Reply | To 18 | View Replies]

To: Ancesthntr

Sorry if your comment went over my head. I was diving under the glaciers looking for Judge Crater too.

Since there are two large craters under the glaciers, they must be somebody’s FAULT. /sarc

[I’ll duck now and avoid waiting for your next comet]


20 posted on 02/13/2019 12:00:52 AM PST by MadMax, the Grinning Reaper (with)
[ Post Reply | Private Reply | To 19 | View Replies]


Navigation: use the links below to view more comments.
first 1-2021-23 next last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson