Firstly, seismic sensors arose and the event that originated around an island between Madagascar and Africa. Then alarm bells began to ring as far away as Chile, New Zealand and Canada.
Hawaii, almost exactly on the other side of the planet, also raises the incident.
Nobody knows what it was.
Meteorit? Underground vessel? Nuclear test?
"I do not think I've seen anything like him,"National Geographic reports that the University of Colombia's seismologist Göran Ekström says. "It does not mean, ultimately, because they are exotic."
In the middle of the mystery is the Mayotte small island, located around halfway between Africa and Madigascar. It has been the subject of swarm earthquakes since May. Most have been small, but the largest – on May 8 – was the largest in the recorded history of the island, size 5.8.
But the earthquake swarm had been deteriorating before finding a mysterious phone earlier this month.
Ekström, who specializes in unusual earthquakes, notes a lot about the 11 November event weirdly. It seemed as if the planet was ringing like a bell, holding a low frequency monoton as it spreads.
Earthquakes, by their own nature, usually register as cracks & # 39; short-short. As tensions in the Earth's coat are released suddenly, obviously identifiable seismic holes of balls can run out of the place where the slip occurs.
The first signal is known as a primary wave: high frequency compression waves that spread in ponds.
Then there is a secondary wave: these high frequency waves tend to wiggle & # 39; much more.
There are only then surface waves: these slow, deep thumbles tend to hold, and they can circulate the Earth several times.
The November 11 event is notable as primary or secondary waves were not detected.
All that was registered was the deep surface wave, resonating. And it did not rush & # 39; because the earthquake's face is tending to. Instead, it kept a lot less – almost musical – frequency.
National Geographic reports that the French Geological Survey suspects that a new volcano can develop off the Mayotte coast. Although the island has been created by volcanic activity, it has been dormant for more than 4000 years.
The French thinks that a strange phone could be produced by removing magma about 50km off the coast and under deep water. This is supported by GPS detectors that can find Maiotte moving around 5cm to the southeast in less than five months.
But the region has mapped badly. Exactly what is under the sea can only guess.
Ekström believes that the unusual pure sign may have been caused by a magma that ties around inside a chamber, or is forced through a gap in the subscription rocks.
But it's not sure.