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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 NASAs 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 Greenlands ice for signs of other craters.
Using imagery of the ice surface from NASAs 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 NASAs 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
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To: MadMax, the Grinning Reaper
Hey, we all miss someone else’s sarcasm or intent on occasion. Not really a big deal. Peace.
21
posted on
02/13/2019 7:47:27 AM PST
by
Ancesthntr
("The right to buy weapons is the right to be free." A. E. van Vogt, The Weapons Shops of Isher)
22
posted on
05/27/2019 10:25:23 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
"Younger Dryas" (13,000 yr bp) keyword, sorted chrono:
- Extinct flightless bird came 'back from the dead' because of a quirky evolutionary process [2019]
- Prehistory Decoded at Gobekli Tepe [2019]
- Evidence from Chile Supports Younger Dryas Extraterrestrial Impact Hypothesis [2019]
- The Day the World Burned [2019]
- Scientists Find Possible Second Subglacial Impact Crater in Northwest Greenland [2019]
- Geoscientists Find Large Impact Crater in Greenland [2018]
- Massive crater under Greenland's ice points to climate-altering impact in the time of humans [2018]
- Air Force silent after 2-kiloton meteor hits Earth near base (Thule AFB, Greenland) [2018]
- Air Force says no damage from Greenland meteor [2018]
- Air Force remains silent after huge meteor hits near US military base [2018]
- How Greenland scorched its underside [2018]
- Fingerprint of ancient abrupt climate change found in Arctic [Younger Dryas] [2018]
- Ancient Greenland was much warmer than previously thought [2018]
- 12,800 Years Ago, Earth Was Struck by a Disintegrating Comet, Setting Off Global Firestorms [2018]
- Category 5 hurricanes hammered Florida 12,000 years ago, study reveals [2017]
- America's Clovis people wiped out by meteorite 12000 years ago [2017]
- Formed by Megafloods, This Place Fooled Scientists for Decades [2017]
- Study casts doubt on mammoth-killing cosmic impact [what, again?!? /s] [2015]
- Is Global Warming a Hoax? [2015]
- Comet theory false; doesn't explain Ice Age cold snap, Clovis changes, animal extinction [2014]
- Did Ancient Earth-Chilling Meteor Crash Near Quebec? [2013]
- Ice core data supports ancient space impact idea (cosmic impact about 12,900 years ago?) [2013]
- Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago [2013]
- The Maunder Minimum and Climate Change: Have Historical Records Aided Current Research? [2013]
- Don't blame a comet for Clovis culture demise, scientists say [2013]
- Comet May Have Collided With Earth 13,000 Years Ago(MEXICO) [2012]
- Bush tucker feeds an ancient mystery [2012]
- Younger Dryas -The Rest of the Story! [2012]
- The Intriguing Problem Of The Younger Dryas -- What Does It Mean And What Caused It? [2012]
- Clovis Comet Gets Second Look [2012]
- New evidence supporting extraterrestrial impact at the start of the Younger Dryas [2012]
- Reindeer Herder Finds Baby Mammoth in Russia Arctic [2011]
- Plasma, Solar Outbursts, and the End of the Last Ice Age [2011]
- Research shows part of Alaska inundated by ancient megafloods [2010]
- Hour-long hailstorm may have caused 1,000-year freeze, say scientists [2010]
- Earth could plunge into sudden ice age [2009]
- 'Quiet Sun' baffling astronomers [SUN SPOTS HAVE DISAPPEARED] [2009]
- Did a Comet Hit Earth 12,000 Years Ago? [2009]
- Last Ice Age happened in less than year say scientists [2008]
- Greenland Ice Core Analysis Shows Drastic Climate Change Near End Of Last Ice Age [2008]
- How it happened: The catastrophic flood that cooled the Earth [2008]
- SubQuantum Kinetics, wide ranging unifying cosmology theory by Dr. Paul LaViolette [2007]
- An ancient bathtub ring of mammoth fossils [2007]
- Comet May Have Doomed Mammoths [2007]
- The 'wobble' that wipes out life on Earth every 2.5m years [2006]
- Terrestrial Evidence of a Nuclear Catastrophe in Paleoindian Times [2006]
- NOVA | Mystery of the Megaflood | PBS [2006]
- Early Americans faced late Pliestocene climate change [2006]
- Late Pleostocene Human Population Bottlenecks. . . (Toba) [2005]
- Catastrophic Flooding From Ancient Lake May Have Triggered Cold Period [2004]
- North Pole had sub-tropical seas because of global warming [2004]
- Ice Cores Unlock Climate Secrets [2004]
- Ice Age coming into Focus! [2004]
- 17th Century Solar Oddity Believed Linked To Global Cooling Is Rare Among Nearby Stars [2004]
- Mesopotamian Climate Change (8,000 Years Ago) [2004]
- Sky-High Icebergs Carried Boulders From The Rockies To In South-Central Washington [2003]
- Decipher [2003]
- Evidence Aquits Clovis People Of Ancient Killings, Archaeologists Say [2003]
23
posted on
05/27/2019 10:35:26 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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