The Northern shores of Japan were hit by a minor tsunami as a strong undersea earthquake struck off the coast. Waves up to 20 cm was recorded in Kuji, eastern Iwate. The Japan Meteorological Agency has warned that waters were still on a slight rise in Kuji, although ruling out any danger of their swelling too much further. This quake is assumed as an aftershock of the 2011 quake that hit the Tohoku region. The residents on these areas are warned from entering the ocean for some days.
Knowledge is Wealth
- Japan accounts for about 20 per cent of the world’s earthquakes of magnitude 6 or greater.
- The Intensity of an Earthquake is measured by Mercalli Scale (Developed by Giuseppe Mercalli in 1902)
- The Magnitude of an Earthquake is measured by Richter Scale (Developed by Charles F Richter in 1934).
- The branch of science concerned with earthquakes and related phenomena is called Seismology.
- An instrument that measures and records the details of earthquakes – Seismograph.
- The point on the Earth’s surface vertically above the focus of an earthquake – Epicentre.