Japanese scientists detect rare deep-Earth tremor S wave microseism

Scientists in Japan studying earthquakes for the first time have detected a rare deep-Earth tremor, known as an S (secondary) wave microseism. Microseisms are very faint tremors.

The detection was made by scientists from the National Research Institute for Earth Science and Disaster Prevention in Japan.

Key Facts

  • The rare deep-Earth tremor S wave microseism was detected for the first time and traced its location to a distant and powerful storm.
  • The storm in the North Atlantic known as a weather bomb which was a small but potent storm that gains punch as pressure quickly mounts.
  • During the storm, groups of waves had sloshed and pounded the ocean floor which struck between Greenland and Iceland.
  • Using seismic equipment on land and on the seafloor researchers found a tremor known as an S wave microseism.
  • S wave Microseisms are very faint tremors compared to P (primary) wave microseisms and they occur in the 0.05 to 0.5 Hz frequency range.
  • P wave microseisms can be detected easily during major hurricanes. They are fast-moving waves and can travel through gaseous, liquid and solid materials.
  • But the elusive S waves are slower and move only through solid rock, not liquid. Humans feel them during earthquakes.
  • Significance of Discovery: It will help experts learn more about the Earth’s inner structure and improve detection of earthquakes and oceanic storms.
  • Learning more about S waves microseismic will further aid to understand the deeper crust and upper mantle structure.

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Categories: International Current Affairs 2017Science and Technology Current Affairs - 2017

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