This article explains how lists of earthquakes are assembled and interpreted. Compilations of major seismic events (list of major earthquakes) commonly draw on scientific catalogs, contemporary reports and historical sources. Such lists are used by researchers, emergency planners and the public to compare events by size, effects and human impact.

Criteria for inclusion

Notable earthquake lists typically apply one or more objective or subjective filters. Common criteria include:

  • Measured magnitude (a threshold on a magnitude scale)
  • Loss of life or number of injured
  • Economic damage or destruction of infrastructure
  • Geographic or scientific significance (e.g., unusual rupture type)

Scales and measurement

Two distinct concepts are used to describe earthquakes: magnitude and intensity. Magnitude estimates the energy released by the earthquake and is reported on scales such as the original Richter scale and the modern moment magnitude (Mw). The Richter scale, developed in 1935, appears in older references and is still cited for historical comparisons. Today, seismologists prefer moment magnitude for large events. Intensity measures the effects at specific locations; the Modified Mercalli Intensity scale and similar systems classify observed damage and shaking. Comparative tables often translate between magnitude and intensity to give a fuller picture of an event's impact (Richter and related scales).

History and challenges

Creating comprehensive lists is straightforward for the instrumental era but becomes uncertain for older events. Before seismographs were widespread, researchers rely on written records, archaeological signs and geological evidence. Estimating magnitude or intensity from descriptions requires careful interpretation and can lead to differing estimates among sources. Catalog compilers note uncertainties and often provide ranges or confidence levels.

Examples and importance

Some earthquakes are repeatedly cited in lists because of their size, damage, or lessons for hazard reduction. Widely known examples include the 1906 San Francisco earthquake, the largest instrumentally recorded earthquake in Chile in 1960 (often cited as the most powerful measured), the 2004 Indian Ocean earthquake and tsunami, and the 2011 Tōhoku earthquake and tsunami in Japan. These events shaped building codes, tsunami warning systems and scientific understanding of faulting and rupture dynamics.

Reliable lists draw on national and international seismic catalogs and disaster databases, and they make explicit the criteria and sources used. For further comparison and specific event entries consult dedicated catalogs and the linked resources above.