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Although there is more technology available to human beings, there are still mysteries that cannot be solved, right under our feet. The Earth, for example, vibrates every 26 seconds, like a clock. This impulse began to be detected by seismographs in the early 1960s and, to this day, no one knows why. Despite being a tenuous beep, it is enough to be measurable.
For several years now there has been a “discussion” among scientists who disagree with any of the explanations presented to date. So what is shaking our planet?
The Earth shakes mysteriously every 26 seconds
This sign, an impulse, classified as "micro-redness" in the geologist's language, was first documented in the early 1960s by an investigator named Jack Oliver, of the Lamont-Doherty Geological Observatory, USA.
Oliver discovered at the time that this signal came from somewhere south of Ecuador, in the Atlantic Ocean. Additionally, the investigator was able to see that it was strongest in the Northern Hemisphere summer months (or Southern Hemisphere winter).
Without realizing the relationship between the subject, in 1980, Gary Holcomb, a geologist with the US Geological Survey, also examined the strange micro -ism and found that it is stronger during storms. However, his work ended up getting lost in time, even as the shaking continues under our feet.
Later, in 2005, Mike Ritzwoller, a seismologist at the University of Colorado, and his team encountered the strange pulse again. At the time they tried to collect what was on the subject, using what Oliver had discovered and little or nothing that Gary Holcomb had been able to perceive.
Thus, then graduate student Greg Bensen worked with seismic data in his laboratory. Ritzwoller wanted to know what they found and Bensen showed him what he got. A strong signal appeared and was recorded from a distant place.
As soon as we saw this, [o então investigador de pós-doutoramento] Nikolai Shapiro and I recognized that something was strange, but we had no idea what it was.
Ritzwoller explained.
Data that left the team perplexed with something without explanation
Admired by the findings, the team examined the bips from all possible angles. But do the tools have a problem? Or will it be the analyzes? So, is this seismic activity really happening?
In fact, all the signs indicated the latter hypothesis. As such, the team was even able to triangulate the wrist at its origin. They came to a single source in the Gulf of Guinea on the west coast of Africa. Then, they unearthed the work of Oliver and Holcomb and published a study in 2006 in Geophysical Research Letters.
However, to date, no one has actually confirmed the origin of this regular seismic activity. Some claim to be caused by waves, others claim the source is volcanic activity. While this particular momentum is intriguing, the fact that there is seismic activity during a period of silence (i.e., not during an earthquake or volcanic eruption) is old news. There is always a background of subtle seismic noise around us.
Seismic noise exists mainly due to the sun. Our star heats the Earth more at the equator than at the poles, which generates winds, storms, currents and ocean waves. When a wave hits the shore, the energy is transferred to the Earth.
It's like you're hitting your table. It deforms the area near the joint, but then it is transmitted across the table. So, someone sitting on the other side of the table, if they put their hand, or maybe their cheek on the table, they can feel the vibration.
Ritzwoller explained.
The waves breaking on solid ground
In 2013, still without a clear explanation of the mystery, Garrett Euler, the University of Washington seismologist, came up with another position. According to him, this quake occurs in a part of the Gulf of Guinea called the Bight of Bonny. He argued that the waves that hit the coast were probably the cause.
When waves cross the ocean, the pressure difference in the water may not have much effect on the ocean floor. But when it reaches the continental shelf - where solid ground is much closer to the surface - the pressure deforms the ocean floor (just as impact on a table deforms the surface) and causes seismic pulses that reflect wave action. .
Doug Wiens of the University of Washington in St. Louis said.
Despite this explanation, not everyone was fully convinced. In an article from the same year, a team led by Yingjie Xia from the Wuhan Institute of Geodesy and Geophysics in China proposed that the most likely source of the 26-second micro -ism was not waves, but volcanoes. This is because the point of origin of the impulse is suspiciously close to a volcano on the island of São Tomé, in Bonny Bay.
In fact, there is at least one other place on Earth where a volcano causes a micro -ism with some similarities to it. This is the Aso volcano in Japan.
Therefore, 60 years later it was understood that there is something mysterious, no one yet knows with firmness and certainty what it is. The Earth vibrates every 26 seconds and no one knows why.
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