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Earth’s Mysterious “Heartbeat”: Investigation Into a Fascinating Phenomenon

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La voix du futur
4 minutes de lecture

Did you know that Earth emits a regular “heartbeat,” detectable every 26 seconds, and has been doing so for over 60 years? This phenomenon intrigues the scientific community, which is still seeking to unravel the secrets of this planetary pulse.

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A pulse detected all over the planet

It was in the early 1960s that American seismologist Jack Oliver, then at the Lamont-Doherty Observatory at Columbia University, first noticed a rhythmic seismic signal, perfectly regular, repeating every 26 seconds. This “heartbeat” is so constant that it could serve as a natural clock. Since then, it has been recorded by seismic stations around the world, particularly in West Africa, North America, and Europe.

Unlike conventional earthquakes, this signal, called a “microseism,” is too weak to be felt by humans, but it is distinctive enough to be detected by modern instruments. Its regularity and persistence make it one of the most intriguing geophysical phenomena of our time.
Fascinating.

Where does this heartbeat originate?

Studies converge on an origin located in the Gulf of Guinea, off the coast of West Africa, more precisely in a region called the “Bight of Bonny.” This is where the signal appears strongest, suggesting that the phenomenon originates at the bottom of the equatorial Atlantic Ocean.

What hypotheses have been proposed?

Despite decades of research, the exact origin of this heartbeat remains a mystery. Several theories have been proposed:

  • Ocean waves : The most widespread theory suggests that deep-water waves, striking the continental shelf of the Gulf of Guinea, generate rhythmic pressure that propagates through the Earth’s crust in the form of regular seismic waves. This “resonance” could explain the consistency of the phenomenon.
  • Volcanic activity : Some researchers have considered the presence of an underwater volcano in the region, but no significant volcanic activity has been detected to date.
  • Fissures in sediments : A more recent hypothesis suggests the accumulation and periodic release of pressure in layers of water-saturated sediments beneath the ocean floor. This mechanism, similar to a natural hydraulic pump, could explain the regularity of the signal.
  • Earth’s “clarinet” : In 2023, a Hamburg-based team proposed a musical analogy, comparing the phenomenon to a clarinet whose air column vibrates under particular conditions at the bottom of the ocean.

Despite all these leads, no explanation has yet been confirmed by direct observations or sufficiently precise in situ measurements.

Why is this phenomenon so fascinating?

This heartbeat, though harmless, offers a unique window into the interactions between the ocean, the Earth’s crust, and the planet’s internal processes. It illustrates the complexity and vitality of Earth, reminding us that our planet is far from being a simple inert mass.

“It is remarkable that these tremors occur so regularly, and have been doing so for so many decades,” notes geologist Lars Eivind Augland.

Moreover, the 2020 pandemic, by reducing human-caused seismic noise, made it possible to observe this natural pulse with unprecedented clarity, renewing scientific interest in this mystery.

A mystery still unresolved

To date, Earth’s “heartbeat” every 26 seconds remains an enigma. Scientists agree on its reality, but its precise origin remains to be discovered. This phenomenon reminds us that, despite all our technological advances, the blue planet continues to surprise us and fuel our curiosity.

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