Earthquake Current Affairs

Government launches India Quake app for earthquake parameter dissemination

The Union Ministry of Earth Science has launched India Quake application on the occasion of its foundation day.

The mobile app has been developed by the National Centre for Seismology (NCS) for automatic dissemination of earthquake parameter (location, time and magnitude) after the occurrence of earthquakes

Key Features of India Quake app

The App facilitates information dissemination faster with no restrictions on the number of recipients. It will provide real time earthquake location information on mobile of the user. It also will help in reducing panic amongst people during an earthquake.

The app will notify two categories of events scrutinized and unscrutinized. Unscrutinized earthquake events are those whose parameters have been estimated automatically by the software using the incoming waveform data from remote stations. In the case of scrutinized events category, the unscrutinized will be scrutinized and confirmed by the NCS.

Background

The National Centre for Seismology (NCS) under the Ministry of Earth Science operates national seismological network with 84 stations. These stations are connected to NCS headquarter for real time data communication through VSAT.

In case of an earthquake, NCS locate these stations using data from its network and disseminate earthquake parameters to all concerned government departments and other stake holders through email, SMS and fax.  However this causes some delay in dissemination and also restricts the number of recipients.  India Quake app will overcome this problem.

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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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