# Earthquake Frequency - ***Magnitude* is according to the [[Richter Magnitude Scale]]** - *Energy* is the equivalent energy released by so many kilograms of TNT. The Hiroshima atom bomb was equivalent to about 16,000,000 kg of TNT. - ***Frequency* is worldwide per year** | Magnitude | Energy | Frequency | | --------------------------- | -----------:| ---------:| | 2 – generally not felt | 15 | 1,000,000 | | 3 – minor, often felt | 476 | 100,000 | | 4 – noticeable shaking | 15,000 | 10,000 | | 5 – some property damage | 476,000 | 1,500 | | 6 – property damage | 15,000,000 | 120 | | 7 - billions of $ of damage | 476,000,000 | 18 | | 8 – large economic impact | 15 billion | 1 | | 9 – Vast area destruction | 476 billion | <1 | Historical earthquakes: - Haiti, 2004. Magnitude 7.0. $11 billion in damages. - Sumatra, 2004. Magnitude 9.1. - Japan, 2011. Magnitude 9.0. - Great Chilean Earthquake, 1960. Magnitude 9.5. According to Voyapon, an organization dedicated to promoting Japanese culture, 20% of all earthquakes occur in Japan.[^1] [^1]: Voyapon. [Getting Help in Japan: Medical, Criminal and Natural Disasters](https://voyapon.com/getting-help-medical-criminal-natural-disasters-japan/). ## Sources - Incorporated Research Institutions for Seismology. [How Often Do Earthquakes Occur?](https://www.iris.edu/hq/inclass/fact-sheet/how_often_do_earthquakes_occur)