Vibrations off Madagascar baffled experts but now they believe they have the answer
It is the kind of mystery scientists relish. On 11 November, something stirred near the French island of Mayotte off the west coast of Madagascar and sent a rumble around the world. Travelling at 9,000mph, the deep hum hurtled past earthquake detection systems unnoticed. No one appears to have felt a thing.
The event came to light on Twitter when seismology enthusiasts posted weird signals they had spotted in recordings made by seismic stations from Kenya to Hawaii. Having ruled out the violent lurches of an earthquake, educated guesses gave way to more fanciful theories. Was it a landslide? A meteorite exploding in the atmosphere? The awakening of some long-dormant sea monster?
Continue reading...from The Guardian https://ift.tt/2TZVgf5
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