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備註請放最後面 違者新聞文章刪除

1.媒體來源:

外媒    sciencealert

2.記者署名:

Michelle Starr

3.完整新聞標題:

Giant Gravity Anomaly Under Antarctica Is Getting Stronger, Scientists Reveal

科學家揭示：南極洲下方的巨大重力異常正在增強

4.完整新聞內文:

Giant Gravity Anomaly Under Antarctica Is Getting Stronger, Scientists Reveal
Nature
19 February 2026
By Michelle Starr

https://i.urusai.cc/IQYuz.jpg

Giant Gravity Anomaly Under Antarctica Is Getting Stronger, Scientists Reveal
The Antarctic Geoid Low. (GReD)

Although Earth is approximately spherical, its gravity field doesn't adhere
to the same geometry. In visualizations, it more closely resembles a potato,
with bumps and divots.

One of the strongest of these depressions – where the gravity field is
weaker – lies under Antarctica. Now, new models of how the so-called
Antarctic Geoid Low evolved over time have shown that it's only getting
stronger, driven by the long, slow movement of rock deep below Earth's
surface, like a giant shifting in its sleep.

科學家揭示：南極洲下方的巨大重力異常正在增強
自然
2026年2月19日
經過米歇爾· 斯塔爾
科學家揭示：南極洲下方的巨大重力異常正在增強

南極大水準面低點 （GReD）

雖然地球近似球形，但它的引力場並不遵循同樣的幾何形狀。在可視化圖中，它更像一個
馬鈴薯，表面凹凸不平。



"If we can better understand how Earth's interior shapes gravity and sea
levels, we gain insight into factors that may matter for the growth and
stability of large ice sheets," says geophysicist Alessandro Forte of the
University of Florida.

Earth's geoid – the bumpy potato shape of the gravitational field – is
uneven because gravity is linked to mass, and the mass distribution inside
the planet is uneven, due to different rock compositions having different
densities.



地球的大地水準面—重力場凹凸不平的馬鈴薯形狀—是不均勻的，因為重力與質量有
關，而地球內部的質量分佈不均勻，這是由於不同岩石成分的密度不同造成的。

https://youtu.be/iCptIGM1cg8

It's not a huge difference that you'd notice at the surface. Maps tend to
exaggerate it so we can see what's going on; if you weighed yourself at a
geoid low and a geoid high, the difference would be just a few grams.

Nevertheless, the geoid represents a window into processes deep inside Earth
that we can't observe directly.

Forte and his colleague, geophysicist Petar Gliviof the Paris Institute
of Earth Physics in France, generated a detailed map of the Antarctic Geoid
Low using another window into Earth's interior: earthquakes. Seismic waves
from earthquakes travel through the planet, changing speed and direction as
they encounter materials with different compositions and densities.

"Imagine doing a CT scan of the whole Earth, but we don't have X-rays like we
do in a medical office," Forte explains. "We have earthquakes. Earthquake
waves provide the 'light' that illuminates the interior of the planet."

表面上看，這種差別並不大。地圖往往會誇大這種差別，以便我們能看清地形；如果你分
別在大地水準面低點和高點稱重，差別可能只有幾克。

然而，大地水準面為我們了解地球內部我們無法直接觀測到的過程提供了一個窗口。



「想像一下對整個地球進行CT掃描，但我們沒有像診所裡那樣的X光設備，」福特解釋。
“我們依靠的是地震。地震波提供的‘光’照亮了地球內部。”

Using the earthquake data, the researchers constructed a 3D density model of
Earth's mantle and extrapolated it into a new map of the entire planetary
geoid. They compared this map with the gold-standard gravity data collected
by satellites and found it to be a close match.

That was the easy part. The next step was to try to turn back the clock to
assess how the geoid has evolved since the early Cenozoic, 70 million years
ago.

Forte and Glivifed their map into a physics-based model of Earth's
mantle convection, rewinding Earth's interior geological activity to see how
the geoid evolved over that timeframe.

Then, from their starting point, they let the model run forward to see if it
could reproduce the geoid we see today.



那隻是最簡單的部分。下一步是嘗試追溯時間，評估自新生代早期（7000萬年前）以來大
地水準面的演進過程。

Forte 和 Glivi將他們的地圖輸入到基於物理的地球地函對流模型中，回溯地球內
部的地質活動，以觀察大地水準面在該時間段內的演變情況。

然後，他們從起點出發，讓模型向前運行，看看它是否能夠重現我們今天看到的地球大地
水準面。

They also checked whether their model reproduced real changes in Earth's
rotational axis known as True Polar Wander. It arrived at the current geoid
and matched the polar wander, suggesting it also provides an accurate
representation of the geoid's evolution.

The results showed that the Antarctic Geoid Low is not a new development; a
gravitational depression has been sitting near Antarctica for at least 70
million years. But it hasn't remained static. About 50 million years ago, its
position and strength started to change dramatically – timing that matches a
sharp bend in the polar wander.

According to the model, the anomaly formed as tectonic slabs subducted
beneath Antarctica and sank deep into the mantle, altering the planet's
gravity field at the surface. Meanwhile, a broad region of hot, buoyant
material rose upward, becoming more influential over the past 40 million
years and strengthening the geoid low.







Interestingly, this may be linked to the glaciation of Antarctica, which
began in earnest around 34 million years ago. It's only a speculative link,
but here's the interesting thing about the geoid: it shapes sea level. So, as
the geoid shifted downward around Antarctica, the local sea surface would
have lowered with it – potentially influencing the growth of the ice sheet.

That's obviously a hypothesis that requires further testing. However, the
work does show that different geodynamic processes, from mantle convection to
the geoid to the motion of the poles, can all be connected and influence each
other.

The gravity hole under Antarctica may be subtle, but it is a reminder that
even the slowest processes deep inside Earth can leave a lasting impression
on the world above.

The research has been published in Scientific Reports.



這顯然是一個需要進一步驗證的假設。然而，這項研究確實表明，從地函對流到大地水準
面再到極點運動，不同的地球動力學過程都可以相互連結並相互影響。

南極洲下方的重力空洞可能很細微，但它提醒我們，即使是地球深處最緩慢的過程，也能
對地上世界留下持久的影響。

這項研究成果已發表在《科學報告》。

5.完整新聞連結 (或短網址)不可用YAHOO、LINE、MSN等轉載媒體:

https://reurl.cc/GGW8j3

6.備註:

IT'S OVER

https://i.urusai.cc/Hdylt.jpg

ADAM RUINED EVERYTHING

禮成奏樂

https://youtu.be/AuJgbOQqjK8

順帶一提，2026年2月17日（農曆正月初一）南極發生日蝕，至於有什麼東西醒來？
還需要等待南極科考團的進一步回報。

https://youtu.be/xvpBDopIMxw




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※ 作者: STAV72 2026-02-19 17:08:01
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※ 文章網址: https://www.ptt.cc/bbs/Gossiping/M.1771492084.A.697.html