The Earth’s Hum – A Mysterious Noise

For the first time, scientists have recorded a humming sound that the earth has probably been producing for a long time. Scientists have been aware of the hum for decades, but for the first time, a team of experts have actually been able to record it

57 seismometers were placed over millions of square kilometres of the Indian Ocean.  Ultralow radio frequencies were recorded on the ocean’s floor

For some time, geologists have pointed out that the earth is not silent but vibrates almost everywhere. However, it is a sound with a frequency thousands of times lower than what the human ear can hear.

Scientists don’t know what causes the earth’s hum but could learn more by getting a clearer audio signal. There are a few theories about where the sound may come from. Some say that it’s the echo of waves crashing onto the coast, while others think that it may be the atmosphere in motion. Geologists, however, agree that the sound does not come from earthquakes because it is continuous.

In 1998 Japanese scientists proved that the earth’s hum was real, but nobody has been able to record it until now. Geologists hope that by analysing the recording they can get more information on the interior structure of the earth.

 

Seismometers record all kinds of noises and disturbances on the surface of the earth
Seismometers record all kinds of noises and disturbances on the surface of the earth

Words

  • agree = to have the same opinion
  • analyse = look at very closely in order to get more facts
  • atmosphere = the mixture of gases that surrounds a planet
  • audio signal = sound
  • aware = to know that something exists
  • cause = the reason for something
  • continuous = when something goes on all the time
  • crash = to hit something very hard
  • decade = ten years
  • earthquake = a sudden shaking of the earth’s surface that causes a lot of damage
  • geologist = person who studies rocks and how they make up the surface of the earth
  • humming = a steady low sound
  • in motion = moving
  • interior structure = what something consists of, or what it is made up of inside
  • place =  put, install
  • point out = to say how important something is
  • radio frequency = waves that are produced when you send out a radio signal
  • record = information about something that is written down or stored on a computer
  • seismometer = machine that measures how the ground moves
  • vibrate = to shake quickly and steadily in very small movements

 

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