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  • Re: On the detection of the Wilkes Land impact crater

    From x@21:1/5 to erik simpson on Tue Apr 15 11:26:11 2025
    On 4/13/25 09:07, erik simpson wrote:
    https://earth-planets-space.springeropen.com/articles/10.1186/s40623-018-0904-7

    Abstract

    The definitive existence of a giant impact crater, two times larger than
    the Chixulub crater in the Yucatan peninsula, from an extraterrestrial origin, 1.6 km beneath Wilkes Land, East Antarctica, remain
    controversial. Here, we use the latest high-resolution
    gravito-topographic geopotential (SatGravRET 2014) model over Antarctica
    to offer a plausible confirmation of its existence. SatGravRET 2014 has
    a spatial resolution between 1 and 10 km at most places and included contemporary space gravimetry and gradiometry data from GRACE and GOCE,
    and other data including Bedmap 2 bedrock topography. We computed the
    gravity disturbances, the Marussi tensor of the second derivatives of
    the disturbing potential, the gravity invariants and their specific
    ratio, the strike angles and the virtual deformations to quantify the detailed geophysical features for the Wilkes Land anomaly. This set of
    the gravitational parameters revealed enhanced and more detailed
    geophysical features on the Wilkes Land Crater than previously possible
    only with the traditional gravity anomalies. Our findings support prior studies stating that in the Wilkes Land there is a huge impact
    crater/basin with detectable gravity mascon which is mostly consistent
    with the characteristics of an impact crater.

    The discussion includes the following: "These results widen space for geophysical interpretations and speculations. The huge impact had a
    planetary consequence, including for example the striking antipodal relationship of it to the Siberian Raps (claimed by von Frese et al.
    2009).".

    If "Siberian Raps" really means Siberian Traps, the paleontological implications are obvious.

    Maybe I am reading this article way off, but it seems to me that
    it might imply that some remnants of the theoretical crater might
    be in Australia, based upon the theory of continental drift.

    Australia in geologic time might have been closer to Antarctica than
    it is now. A lot of Australia now is not under a lot of ice like
    Antarctica is, and this might make some data easier to gather in some
    ways. Can you find any data or articles on the theoretical Australian
    remnants of the crater if such data or such a crater exists?

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  • From Popping Mad@21:1/5 to erik simpson on Wed Apr 16 06:24:44 2025
    On 4/15/25 4:40 PM, erik simpson wrote:
    gravito-topographic geopotential


    HOW do you measure gravity?

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  • From Popping Mad@21:1/5 to erik simpson on Wed Apr 16 06:25:03 2025
    On 4/15/25 4:40 PM, erik simpson wrote:
    gravito-topographic geopotential


    How do you measure gravity?

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  • From Mikko@21:1/5 to Popping Mad on Thu Apr 17 12:03:12 2025
    On 2025-04-16 10:25:03 +0000, Popping Mad said:

    On 4/15/25 4:40 PM, erik simpson wrote:
    gravito-topographic geopotential

    How do you measure gravity?

    THe easiest way is to buy a device that is made for that purpose.

    --
    Mikko

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  • From Popping Mad@21:1/5 to Mikko on Tue Apr 22 01:32:44 2025
    On 4/17/25 5:03 AM, Mikko wrote:
    THe easiest way is to buy a device that is made for that purpose.

    like a troll. A troll is senstive to gravity waves

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  • From x@21:1/5 to Mikko on Tue Apr 22 15:48:22 2025
    On 4/17/25 02:03, Mikko wrote:
    On 2025-04-16 10:25:03 +0000, Popping Mad said:

    On 4/15/25 4:40 PM, erik simpson wrote:
    gravito-topographic geopotential

    How do you measure gravity?

    The easiest way is to buy a device that is made for that purpose.

    Devices made for a specific purpose are often vastly expensive
    in comparison with another near equal device made for another
    purpose.

    Of course some times they may appear near equal, but maybe
    they are not.

    It is often of course also easier to buy something that
    is more expensive in comparison with something that is
    less expensive. At least unless you do not have the money
    (like taking out a loan).

    I have read that something like a 'Pangea' may have formed
    at the end of the Permian, and may have 'separated' some
    near the end of the Triassic. This (might) have produced
    some climate change across some of the world's land areas
    and this (might) have resulted in some extinctions.

    I am open to the idea that something else may be possible.

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  • From x@21:1/5 to Popping Mad on Thu Apr 24 14:50:40 2025
    On 4/21/25 22:32, Popping Mad wrote:
    On 4/17/25 5:03 AM, Mikko wrote:
    THe easiest way is to buy a device that is made for that purpose.

    like a troll. A troll is senstive to gravity waves

    Lotta impacts. Pick and choose any extinction. 250-500 is good enough.

    https://en.wikipedia.org/wiki/List_of_possible_impact_structures_on_Earth

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