Seismologists around the world are increasingly using improved seismic measurement methods, which has caused the traditional Richter scale to lose its status as the main reference for evaluating the magnitude of earthquakes. The change, which reflects the search for greater scientific precision, was consolidated on August 10, 2026, with the recognition of new approaches that offer more reliable data on the real energy released by tremors.
Understand the creation and limits of the Richter scale
Created in 1935 by seismologist Charles Richter, the scale was developed to compare the intensity of earthquakes in California, United States. It calculates magnitude based on the amplitude of seismic waves recorded by specific seismographs. Although it was revolutionary for its time, the Richter scale had notable limitations in large events.
Scale saturation for large tremors
One of the main reasons for the disuse of the Richter scale in large events is the phenomenon of “saturation”. This happens when the amplitude of the recorded seismic waves stops growing in proportion to the actual energy that an earthquake releases. Consequently, two earthquakes of very different magnitudes can receive similar Richter values, underestimating the power of the most intense tremors. This inaccuracy compromises the analysis of major natural disasters and risk prevention.
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New Era: The Moment Magnitude Scale
Currently, the global scientific community primarily adopts the moment magnitude scale (MMS) as its main metric. Unlike Richter, MMS is not just based on wave amplitude. It considers more complex and comprehensive factors, providing a more accurate measurement of the energy released by an earthquake.
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- The moment magnitude scale calculates:
- The total area of the geological fault that ruptured.
- The average displacement along this fault.
- The rigidity of the rock at the event site.
The importance of more accurate measurements in seismology
The transition to more sophisticated methods, such as the moment magnitude scale, is vital to modern seismology. More accurate measurements allow researchers to:
- Better understand the dynamics of tectonic plates.
- Improve tsunami forecasting and warning models.
- Guide the development of safer building codes in earthquake-prone regions.
- Adequately quantify the impact and potential risk of major seismic events in urban and coastal areas.
This evolution in the way of measuring earthquakes highlights the continuous advancement of science and the incessant search for tools that provide a more faithful understanding of the planet’s natural phenomena.