Seismore sensors first came up with the event by an island between Madagascar and Africa. Then alarm clocks started as far as Chile, New Zealand and Canada.
Hawaii, just on the other side of & # 39; Planet, also the event # 39; recorded.
No one knows what it was.
Meteorite? Submarine fulkan? Nuclear test?
"I do not think I've seen what"National Geographic reports Columbus University seismologist Göran Ekström as said. "It does not mean that at last, the cause of her is exotic."
In the center of the mystery is the small island of Mayotte, or half between Africa and Madigaskar. It has since mid-summer a swarm of earthquakes. Most are less, but the largest – on May 8 – was the largest in recorded history of # 39; The island, magnitude 5.8.
But the earthquake swarm had been in error, before the mysterious sound was discovered earlier this month.
Ekström, which is specialized in unprecedented earthquakes, points out a lot about the 11th November event. It was like the planet or a bell, a subdivision monoton kept as it expanded.
The earthquakes, by their nature, usually register as short sharp edges. For tension in Earth # 39; s loose places, impulses of clearly identifiable seismic waves from the direction away from & # 39; the way.
The first signal is called a primary wave: high frequency of comet waves in the bush.
Then comes a secondary wave: the high frequency calls the "wiggle" something more.
Only then, the surface floods are: these slow, deep rumbles tend to direct the earth several times.
The November 11 event is remarkable that no primary or secondary waves were found.
All that was registered was the deep, resonant surface wave. And it does not call "rumbling" as an earthquake of the supposed law. In the state it remained a very pure – almost musical – frequency.
National Geography reports to the French Geological Survey that a new volcano could develop from the coast of Mayotte. While the island is made by volcanic activity, it is very bad for over 4,000 years.
The French believe that the strange ringing can be made possible by a movement of magma or 50 km from the coast and under deep water. This is supported by GPS sensors Mayotte detection has moved many 5cm to southeast in less than five months.
But it is a minor map region. Everything that can under the ocean can only be seen.
Ekström believes that the magic pure magnesium may be slaughtered inside a camera, or forced through a hole in the underground bicycle.
But he is not sure.