Scientists are losing to explain a strange seismic event that shaken the planet on November 11th and earthquake sensors were raised around the world.
Although the cause of this mysterious disturbance remains unknown, it's somehow associated with a continuous seismic swarm that has been dropping the Mayotte archipelago in the Indian Ocean for several months – but only what it is & These unusual gatherings ultimately assume them are unclear.
"I do not think I've seen anything like it," said the scholar Göran Ekström of Columbia University National Geographic for inconsistency November 11.
Almost just half a year before this strange signal came to an end, there was another form of unusual seismic activity surprised by seismologists in the same vicinity: a rotation of hundreds of small and frequent earthquakes that flow from about 50 kilometers ( 31 miles) off the eastern coast of Mayotte.
The network of islands and lowlands, located around halfway between Africa and Madagascar, is governed by France, but the island of the Comoros also claims that.
On May 10th, this region was grounded by an unexpected earthquake, and did not come alone – following a series of hundreds of rolling rides that have disappeared.
The most dramatic of these – the 5.8 size event on May 15 – was the largest ever recorded in the Comoros basin, and although the swarm has actually fallen overall since this 5.1-year-old revival was serve not to do so, a subtle reminder that this terrestrial trauma is not over.
Although earthquake swarm sounds scary, they are not necessarily dangerous events.
In this case, an introductory breakdown of the seismic swarm by researchers in the Eccole's normal rehabilitation in Paris suggests that a tectonic movement can not be counted solely by the tectonic movement, which means volcanic activity in the region also has to take part.
That brings us to November 11.
– ******* Pax (@matarikipax) November 11, 2018
Less than three weeks ago – during the rotation, but on a day when tied gatherings were not discovered – scientists had registered something else: a strange, long vibrant vibration and flat, without the intermittent variations that # 39; n the signature of the normal activity earthquake.
Instead, this "very atypical low frequency frequency" – to quote France's Béro-Recrections Géologiques (BRGM) – is repeated in a ton for every 17 seconds, which lasts for about 20 minutes.
"There are many things that we do not know," said research engineer Nicolas Taillefer, head of BRGM's seismic and volcanic risk unit National Geographic.
"There's something quite new in the signals on our stations."
This is not to say that the team does not have a hypothesis. With what we already suspect about the seismic swarm, speculation and best researchers are the uncommon connection with volcanic activity, perhaps due to a huge movement of magma under the Indian Ocean.
If so, this could also explain something else: Mayotte is not empty.
GPS readings indicate since July – after the swarm started – the island has moved about 60 mm (2.4m) to the east and 30 mm (1.2 i) to & # 39 ; r de.
According to one analysis, this move could be due to the removal of a nearby magma fund, although additional research would be required to verify this.
SBV, like the other stations, shows a long monochromatic signal with a period ~ 17 (Rayleigh mono-freq? Waves). But it has filtering over 1Hz SBV (lower plot) also shows seismic signals from repetitive sources, with some 50s separately. Maybe some large volcanic, bass, oscillating source? pic.twitter.com/bPqdQFwAgm
– Anthony Lomax ??? (@ALomaxNet) November 11, 2018
If the assumption appears correctly, no-one can certainly say what might happen, but the modeling shows that Mayotte could keep moving as long as the swarm continues.
Regarding whether we will encounter the mysterious signal again, no-one knows.
Therefore, these comments complement the presumption of a combination of tectonic and volcanic effects that account for a geological phenomenon that includes a seismic sequence and a volcanic phenomenon, "the BRGM explains.
"This theory will need to be confirmed by future scientific studies."