## Basic Differenece of Intensity & Magnitude of Earthquake

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**Intensity of Earthquake**

The intensity of earthquake at a place is a measure of the strength of shaking during an earthquake. It is measured on two scales mainly Modified Mercalli Intensity (MMI) Scale and Medvedev Sponheuer Karnik (MSK) Scale having scale range of I to XII in Roman Capital Numerical. In this grade scale “ I ” represent least perceptive and grade scale “ XII ” represents most severe. From this it can be said that Intensity is a qualitative form of measurement.

##### Must read: Seismic Zones of India: All you Need to Know

**Grade of Intensity of Earthquake is measured from the table below:**

**Grade of Intensity**

**Type of Earthquake**

**I**

- Only recorded by seismographs

**II**

- Only felt by individual people at rest

**III**

- Only felt by a few people

**IV**

- Felt by many people. Dishes & doors rattle

**V**

- Hanging objects swing, many sleeping people awake

**VI**

- Slight damage in buildings and small cracks in plaster

**VII**

- Cracks in plaster, gaps in wall & chimneys

**VIII**

- Wide gaps in masonry, parts of gables & cornices fall down

**IX**

- In some buildings walls and roofs collapse, landslips

**X**

- Collapse of many buildings, cracks in ground up to widths of 1m

**XI**

- Many cracks in ground, landslips and falls of rocks

**XII**

- Strong changes in surface of the ground

As intensity of earthquake is an indicator of severity of shaking at a particular location. So, the intensity of a particular earthquake is different for different locations.

**Intensity of Earthquake vs Magnitude of Earthquake**

**01.**

**Intensity of Earthquake**

- The intensity of earthquake at a place is a measure of the strength of shaking during the earthquake.

**Magnitude of Earthquake**

- The magnitude of earthquake is the measure of amount of strain energy released by the fault rupture.

**02.**

**Intensity of Earthquake**

- It is measured mainly on two scales mainly Modified Mercalli Intensity (MMI) Scale and Medvedev Sponheuer Karnik (MSK) Scale.

**Magnitude of Earthquake**

- It is measured in Richter Scale.

**03.**

**Intensity of Earthquake**

- It is measured on a scale range of I to XII in Roman Capital Numerical.

**Magnitude of Earthquake**

- It is measured as logarithm to the base 10 of the maximum trace amplitude and it could even be zero or even negative.

**04.**

**Intensity of Earthquake**

- The intensity of a particular earthquake is different for different locations

**Magnitude of Earthquake**

- The magnitude of earthquake is a single value for a particular earthquake.

**05.**

**Intensity of Earthquake**

- It is a qualitative form of measurement.

**Magnitude of Earthquake**

- It is a quantitative form of measurement.

**Magnitude of Earthquake:**

The magnitude of earthquake is the measure of amount of strain energy released by the fault rupture. It is measured in Richter Scale and have no upper or lower limits, it can be even zero or even negative. Richter Scale measures it as logarithm to the base 10 of the maximum trace amplitude and is expressed in microns.

From the equation of measuring magnitude it can be seen that by increase of magnitude by 1.0 implies 10 times higher waveform amplitude and about 31 times higher energy released. For instance, energy released in a M 7.5 earthquake is about 31 times that released in a M 6.5 earthquake, and is about (31×31) times that released in a M 5.5 earthquake.

The magnitude of earthquake is a single value for a particular earthquake and it is a quantitative measure of earthquake.

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