Unusual seismic waves traveled around the world on November 1 1, and researchers say they have not seen anything like…
Unusual seismic waves traveled around the world on November 1
1, and researchers say they have not seen anything like it before. 19659007] Rumbling originates right outside the sea of Mayotte, an island between the south coast of Africa and Madagascar before shaking through Africa. Locations in Zambia, Kenya and Ethiopia registered the disruption. Even further away, places in Chile, New Zealand, Canada and Hawaii brought up rumbling.
What the French Geological Survey (BRGM) called “atypical very low frequency signal ” was a repeating wave that would record approximately every 17 seconds and lasted approximately 20 minutes in total. It strange, nobody knew it.
“I do not think I’ve seen anything like it “, says Columbia University seismologist Goran Ekström to National Geographic. “It does not mean that in the end, the cause of them is so exotic.”
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] A typical earthquake will release its energy into a burst that contains several different types of waves.
First, P waves, otherwise known as compression waves according to the U.S. Geological Survey. They shake the field back and forth in the motion the wave moves. They typically feel in tiny shakes or shakes, but sometimes they do not feel at all.
Next comes S waves or shear waves. Shear waves shake the ground in a direction perpendicular to the motion of the wave . These feel in bigger shots or stronger shaking.
The third type of wave is surface waves, which adhere to the earth’s surface . A rolling motion may be felt with surface waves.
Surf waves are the most comparable type of wave as recorded on November 11th. In a major earthquake, surface waves can buzz around the world several times.
But there was no earthquake big enough to burn a wave like that played over such a widespread area and no P or S waves were recorded. Even more bizarre, the waves that originated from Mayotte were too clean and uniform compared to a normal earthquake, which has waves of different frequencies.
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Researchers suggest that the latest strange waves are connected to a earthquake sponge that has occurred during the Mayotte coast for several months. Several hundred seismic events have shaken Mayotte since its inception in May – the largest is an order of 5.8, strong enough to be greatest in the island’s recorded history – but no regular earthquakes were recorded where the mysterious shake took place in mid-November. 19659008] It has been suggested that, with what is known about the seismic swarm off the coast, the waves could have been caused by new volcanic activity coming from Mayotte. This theory would compliment the fact that Mayotte has moved about 2.4 inches east and 1.2 inches south since the swarm began due to the movement of large amounts of magma, suggests an analysis from the country’s National Institute for Geographic and Forest Information. 19659008] “These observations therefore give rise to the hypothesis of a combination of tectonic and volcanic effects that tells a geological phenomenon that includes a seismic sequence and a volcanic phenomenon,” writes BRGM and adds that their hypothesis must be supported by future studies.
But for the moment, the cause of mystery waves is unknown.