Question

Which of the following scale is NOT used to measure the intensity of an earthquake?

• A. Rossi-Forel scale
• B. Modified Mercalli
• C. Medvedev Sponheuer Karnik
• D. Graphical Scale

Hint:

Earthquake intensity scales include Modified Mercalli, Rossi-Forel, and MSK scale. A graphical scale is related to maps, not earthquake intensity.

Answer 1

The Correct Option is D

Concept: Earthquake intensity describes the effect of an earthquake at a particular place. It is measured using intensity scales based on observed damage and human experience.

Step 1: Understanding earthquake intensity.
Intensity is different from magnitude. Magnitude measures energy released, while intensity measures the observed effect at a location. \[ \text{Intensity} = \text{Observed effect and damage} \]

Step 2: Checking known intensity scales.
Rossi-Forel scale is an earthquake intensity scale.
Modified Mercalli scale is a widely used earthquake intensity scale.
Medvedev Sponheuer Karnik scale is also used for earthquake intensity.

Step 3: Identifying the incorrect scale.
Graphical scale is not an earthquake intensity scale. It is a general term used in maps or diagrams, not for measuring earthquake intensity. Therefore, the correct answer is Graphical Scale.