The birth of an underwater volcano in the Indian Ocean was so violent that it was more than 10,000 km far from the seismic ripples
- Mysterious low-frequency seismic ripples were felt all over the world
- The French National Center for Scientific Research wanted to clarify its origin
- The unexpected seismic activity was felt 10,000 miles (17,000 km) away
- According to the French Geological and Mining Research Bureau, the team discovered a new volcano at 3500 meters under water
Mysterious low-frequency seismic ripples that spanned the world last year may have been caused by the birth of a submarine volcano, scientists claim.
In 2018, unexpected seismic activity was picked up by seismographers 10,000 miles away and tremors were felt on the French island of Mayotte in the Indian Ocean.
Researchers from the French Center for Scientific Research (CNRS) wanted to clarify the origin of the small earthquakes that shook the island, located between Africa and Madagascar.
According to the French Geological and Mining Research Bureau, the team discovered a new & # 39; submarine volcano & # 39; 50 km away.
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The sonar waves reflect on the seabed near the French island of Mayotte and show the contours of an 800 meter high volcano (red) and a rising gas-rich plume. The French office claims that the birth of a submarine volcano was first observed
The agency said the birth of the volcano, which is 3,500 meters (2.1 miles) under water, has been observed for the first time.
Rising from the ocean floor, the peak is estimated at 2600 feet high (800 meters) and three or four miles wide.
They also claim it has a 1.2 mile (2 km) long plume of volcanic liquids from the highest point, or the crater.
The small population (500,000) who lived in Mayotte, knew for months that something was wrong.
From the middle of last year, they felt small earthquakes almost daily, said Laure Fallou, a sociologist with the Euro-Mediterranean seismological center in Bruyères-le-Châtel, France.
Mayotte has a seismometer, but triangulation of the source of the rumbling requires several instruments, the nearest others being in Madagascar and Kenya.
A scientific campaign only started in February, when the team placed six seismometers on the bottom of the ocean, close to the activity.
The map of the seabed, made by the ship's multibeam sonar, indicates that no less than 5 cubic kilometers of magma has erupted on the seabed.
The sonar also discovered plumes of bubble-rich water rising from the center and flanks of the volcano.
Unexpected seismic activity was felt on the French island of Mayotte, sandwiched between Madagascar and Africa, in the Indian Ocean and picked up by seismograms 10,000 miles away since 2018
There had been nothing in earlier cards. & # 39; This thing has been built from scratch in six months! & # 39; Chaussidon says.
Scientists are now processing the data they have collected over the past months and are trying to assess seismic, volcanic and tsunami.
The crew has also dredged stones from the flanks of the newborn volcano that pop & # 39; when they brought them on board & # 39 ;.
The Institute of Geophysics in Paris (IPGP), said Nathalie Feuillet – a sign of high-pressure gas trapped in the black volcanic material.
HOW ARE EARTHQUAKES MEASURED?
Earthquakes are detected by following the size, or magnitude, and intensity of the shock waves they produce, known as seismic waves.
The magnitude of an earthquake differs from the intensity.
The magnitude of an earthquake refers to the measurement of the energy released when the earthquake originated.
The size is calculated based on measurements on seismographs.
The intensity of an earthquake refers to how strong the shaking produced by the sensation is.
A 5.3-magnitude earthquake hit the Channel Islands off the coast of Southern California on Thursday at 10.30 am
According to the United States Geological Survey, & # 39; intensity is determined by the effects on people, human structures and the natural environment & # 39 ;.
Earthquakes originate below the surface of the earth in a region called the hypocenter.
During an earthquake, part of a seismograph remains stationary and part moves with the surface of the earth.
The earthquake is then measured by the difference in the positions of the stationary and moving parts of the seismograph.
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