Which one of the following is not a Earthquake measuring scale ?

Question

Accepted Answer

Option 4, "Moh," is the correct answer because it is not an earthquake measuring scale. The Moh scale, more accurately known as the Mohs scale of mineral hardness, is used to determine the hardness of minerals by scratching them against each other. It ranks minerals on a scale from 1 (talc) to 10 (diamond) based on their ability to scratch one another. This scale has no relation to measuring earthquakes.

Now, let's explain why each of the other options is incorrect in the context of the question:

1. **Richter**: The Richter scale is a well-known scale used to measure the magnitude of earthquakes. Developed by Charles F. Richter in 1935, it quantifies the amount of energy released by an earthquake. Therefore, it is indeed an earthquake measuring scale.

2. **Mercalli**: The Mercalli intensity scale measures the intensity of an earthquake based on its observed effects on people, buildings, and the Earth's surface. It is a qualitative scale that ranges from I (not felt) to XII (total destruction). This scale is also used for measuring earthquakes, making it incorrect in the context of the question.

3. **Rossi-Forel**: The Rossi-Forel scale is an early scale used to describe the intensity of an earthquake. It was developed in the late 19th century and ranges from I (instrumental) to X (extreme). Although it is not as commonly used today, it is still a scale related to measuring earthquakes.

In summary, Option 4, "Moh," is the correct answer because it is unrelated to earthquake measurement, whereas the other options are all scales used to measure or describe earthquakes.