A photo from open sources
According to a new study, which in many ways explains the mysterious, endless hum of the Earth, it turned out that even planets have their own vibrations.
Scientists have long known that earthquakes can cause “sing” our planet. This “singing” resembles the low sound of a bell, which may sound for several days or even months. However, in the late 1990s, seismologists discovered that our Earth vibrates constantly at very low frequencies, even when the world doesn’t not a single earthquake. This so-called microseismic activity is too weak for us to hear or felt.
It turns out the culprit for these mysterious underground vibrations are ocean waves. Many scientists have previously considered ocean waves as a factor that can explain the unusual the buzz of our planet. In one of the theories, experts suggested that the earth receives vibrations from the vibrations of huge ocean waves, which can expand their path from the water surface to the very the bottom of the ocean where they influence the underwater continental loops. Another theory says that colliding ocean waves cause tremors, and those, in turn, provoke planetary vibrations.
However, none of the proposed ideas can explain the whole spectrum of oscillations of our planet. The new study combines imagine both of these ideas in one model that takes into account the diverse the nuances.
To determine the nature of the mysterious “singing” of the Earth, in the study involved computer models of the oceans, ocean floor and the effect of wind. As a result, scientists found that ocean wave collisions can generate seismic waves with frequency of no more than 13 seconds. When it came to slow waves, they found that ocean waves moving above the seabed, can generate seismic waves with a frequency of 13 to 300 seconds. Most of the planetary hum comes from precisely these underwater long waves whose pressure makes them vibrate ocean floor.
These seismic waves penetrate very deep into the mantle of the planet, and possibly even reach its core. it means waveform analysis can help you get more a detailed picture of the structure of our planet. In addition, scientists suggest that there are other sources of microseismic activities. For example, ocean waves running along the coast lines, landslides of seamounts and ocean ridges.