Search for MH370 Revealed Ocean Crust Waves

Science News by American Geophysical Union ^ | 8 June 2020 | Kimberly M. S. Cartier

[SunkenCiv]

The scans for MH370 revealed that the ocean crust rises and falls in waves that start at the Southeast Indian Ridge and continue outward. The ridge spreads about 35 millimeters in opposite directions every year, and the wave crests, where crust grew faster, are more than 100 kilometers long and repeat every 10-14 kilometers.

The researchers estimated when each wave formed by comparing the bathymetry maps to independent measurements and models of the crust's magnetic field.

...Crustal rocks record the polarity of Earth's magnetic field as they form, allowing scientists to trace the age of different sections of ocean crust.

"You might expect that oceanic crust is formed in this constant process, so you might have a uniform thickness, for example, of oceanic crust being formed," he said. "What we found, actually, is that the pace at which new crust is formed varies on this...characteristic timescale of 300,000-400,000 years." The wavy pattern repeated for 12 million years...

What is odd about these waves, however, is that the characteristic timescale doesn't match up with glacial cycles that are governed by changes in Earth's orbit around the Sun and its axis of rotation. So-called Milankovitch cycles regulate ice coverage and sea level on timescales of 23,000, 41,000, and 100,000 years.

It's been fiercely debated in recent years, Parnell-Turner explained, whether the waxing and waning of sea level modulate how quickly new crust forms at seafloor ridges. Data from oceanic crust not far from the MH370 search site support this theory.

But for the Southeast Indian Ridge, at least, that appears to not be the case.

[SunkenCiv]

The M/V Fugro Equator, here, was one of three ships that collected sonar data from June 2014 to June 2016 searching for MH370. Those data led to a new high-resolution bathymetry map near the Southeast Indian Ridge. Credit: Justin Baulch, Australian Transport Safety Bureau, CC BY 4.0

[SunkenCiv]

join or quit view topics view or post blog bookmark post new topic subscribe

[SunkenCiv]

https://www.express.co.uk/news/weird/1282870/mh370-found-malaysia-airlines-flight-370-missing-plane-news-cambodia-spt

[DocRock]

Thanks for article. I wonder if the thinner sections of those waves will end up as faults eons from now after they subduct.

[FlyFisher]

That is a lot of...um...information. What does it have to do do with flight MH370?

[Freedom_Is_Not_Free]

If they had never scanned the sea floor trying to find flight MH370, then nobody would have made this scientific discovery.

[SunkenCiv]

There's a spoiler right in the title, but excerpts are limited to 300 words. Read the original.

[SunkenCiv]

The rest of the Potsdam Gravity Potato keyword, chrono:

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• Rapid Drift of Magnetic North Explained [2020]
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• New Seafloor Map Reveals How Strange the Gulf of Mexico Is [2017]
• The Search for MH370 Revealed Secrets of the Deep Ocean [2017]
• Scientists find 500 U.S. seabed vents of powerful greenhouse gas [2016]
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[SunkenCiv]

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