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UPSC » Daily News Analysis ‘8.8 Magnitude Earthquake struck the Kamchatka Peninsula, in Russia’ : 31 July

Daily News Analysis ‘8.8 Magnitude Earthquake struck the Kamchatka Peninsula, in Russia’ : 31 July

Table of Content
Details of the Earthquake
  • The earthquake occurred in Russia’s Kamchatka Peninsula, 6,500 km east of Moscow.
  • It generated tsunami waves: 3–4 meters in Kamchatka, ~5 feet in Hawaii, ~2 feet in Japan.
Why Kamchatka?
  • Kamchatka lies on the “Ring of Fire”, a highly active seismic and volcanic zone around the Pacific Ocean.
  • Over 80% of the world’s largest earthquakes occur here.
  • The region has recorded more than 130 quakes of 7+ magnitude since 1900.
Tectonic Cause – Subduction Zones:
  • The quake was caused by subduction, where the dense Pacific Plate moves beneath continental plates, generating pressure and causing quakes.
  • The Ring of Fire has the highest number of subduction zones, explaining its high seismic activity.
  • A similar process created the Himalayas, making them another major earthquake zone.
Other Seismic Belts
  1. Alpide Belt:
    • Runs from Indonesia through the Himalayas to Turkey.
    • Produces 15–17% of global large quakes.
    • Often deadlier due to high population density.
  2. Mid-Atlantic Ridge:
    • Underwater faultline from the Arctic to the Antarctic.
    • Produces moderate quakes with minimal impact due to distance from land.
Strength Limit of Earthquakes
  • The size of faultlines limits quake strength.
  • The largest recorded quake (Chile, 1960) was 9.5 magnitude.
  • Anything stronger (e.g. magnitude 10) would require a faultline nearly the length of the Earth—not geologically possible.
Why in News?  An extremely powerful 8.8 magnitude earthquake struck Russia’s Kamchatka Peninsula, triggering a tsunami that affected multiple Pacific countries.