Science Geologists Discover Largest Underwater Volcano, Explain Weird Hum Heard Around the World

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A strange seismic event off the coast of Africa has led scientists to a mighty finding: the discovery of the largest underwater volcanic eruption ever recorded.

The eruption also may explain a weird seismic event recorded in November 2018 just off the island of Mayotte, located between Madagascar and Mozambique in the Indian Ocean. Researchers described that event as a seismic hum that circled the world, but no one could figure out what sparked it.

For starters, the hum rang at a single, ultralow frequency, which was strange because seismic waves usually rumble at many frequencies. Moreover, there were hardly any detectable "p-waves" or "s-waves," which usually accompany earthquakes. And, incredibly, the island of Mayotte moved a few inches south and east after the mysterious event.

Now, scientists have an idea why. This weird seismic hum was likely the birth announcement of a new underwater volcano, according to Science magazine.

The underwater volcano is enormous, rising nearly a half mile (0.8 kilometers) from the ocean floor. It's the length of a 3.1-mile (5 km) race and lies about 31 miles (50 km) off Mayotte's eastern coast. And it came into being in just six months.

 
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