The Richter Scale and the Mercalli Scale are two important methods used to measure earthquakes. The Richter Scale measures the magnitude or energy released during an earthquake using scientific instruments. In contrast, the Mercalli Scale measures the intensity and impact of the earthquake based on its effects on people, buildings, and the environment. Together, these scales help scientists understand both the strength of an earthquake and the damage it causes.
Richter Scale vs Mercalli Scale
Although earthquake waves are recorded using a Seismograph, the intensity and magnitude of earthquakes are measured using two different scales: the Richter Scale and the Mercalli Scale. Richter Scale vs Mercalli Scale has been discussed below in the table.
| Richter Scale vs Mercalli Scale | ||
|
Basis of Comparison |
Richter Scale |
Mercalli Scale |
|
Definition |
Measures the magnitude (energy released) of an earthquake. |
Measures the intensity and impact of an earthquake on people and structures. |
|
Developed by |
Charles F. Richter |
Giuseppe Mercalli |
|
Year |
Developed in 1935. |
Developed in 1902, later modified as Modified Mercalli Intensity (MMI). |
|
Measurement Type |
Quantitative scale based on scientific instruments. |
Qualitative scale based on observation and damage reports. |
|
Scale Range |
Usually ranges from 0 to 10+ magnitude. |
Uses Roman numerals from I to XII. |
|
Method of Measurement |
Measured using Seismograph that records seismic waves. |
Based on human observations, structural damage, and environmental changes. |
|
Focus |
Focuses on energy released at the earthquake’s focus. |
Focuses on damage and shaking experienced at different locations. |
|
Variation by Location |
The magnitude remains same everywhere for the earthquake. |
Intensity varies from place to place depending on distance from the epicenter. |
|
Accuracy |
Provides objective and precise measurement of earthquake energy. |
Depends on human reports and damage assessment, so it is subjective. |
|
Use in Modern Seismology |
Largely replaced by Moment Magnitude Scale for large earthquakes. |
Still used to describe earthquake impact and damage levels. |
About Richter Scale
The Richter Scale was developed by Charles F. Richter to measure the magnitude of an earthquake, which represents the total energy released during an earthquake.
The scale is open-ended, meaning there is no fixed upper limit, although earthquakes recorded so far have rarely exceeded a magnitude of about 8.9. The Richter Scale is logarithmic with base 10, meaning each increase of one unit represents a tenfold increase in seismic wave amplitude. For example, an earthquake of magnitude 5 is 10 times stronger than magnitude 4 and 100 times stronger than magnitude 3.
About Mercalli Scale
The Mercalli Scale was originally developed by Giuseppe Mercalli to measure the intensity of an earthquake based on its effects on people, buildings, and the Earth’s surface.
Later, the scale was expanded to 12 levels of intensity by Adolfo Cancani and further modified by Harry O. Wood and Frank Neumann, leading to what is now known as the Modified Mercalli Intensity Scale.
The Mercalli Scale is a closed-ended linear scale ranging from Intensity I to Intensity XII. At Intensity I, the earthquake is barely noticeable, while Intensity XII represents total destruction and severe ground disturbance. This scale focuses on observed damage and human experience rather than instrumental measurement.
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Richter Scale vs Mercalli Scale FAQs
Q1. What is the difference between the Richter Scale and the Mercalli Scale?+
Q2. Who developed the Richter Scale?+
Q3. Who developed the Mercalli Scale?+
Q4. What does the Richter Scale measure?+
Q5. What does the Mercalli Scale measure?+
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