India is divided into how many seismic zones according to the earthquake zoning map
Answers
4 seismic zones
Each country in the world has such zoning for all such natural disasters. India is divided into 4 seismic zones i.e. Zones II, III, IV and V. These zones are divided on the basis of Maximum Considered Earthquake and service life of structure in each seismic zone.
Zone V:
The areas of this zone have the highest risk of effects by an earthquake. The earthquake intensity for this zone is MSK-IX or greater. The zone factor for this zone is 0.36, which is indicative of effective (zero period) level earthquake in this zone. This zone is called as Very High Damage Risk Zone. Some of the regions which fall under this zone are Rann of Kutch, Eastern regions etc.
Zone VI
In India, the country has been divided into 4 zones. Earlier there were 5 zones however after Bhuj Earthquake of 2001, the zone I have been eliminated. Each country in the world has such zoning for all such natural disasters. India is divided into 4 seismic zones i.e. Zones II, III, IV and V. These zones are divided on the basis of Maximum Considered Earthquake and service life of structure in each seismic zone.
Also Read: Classification of Type Loads Applied on a Structure
Seismic zone have been categorised as follows:
Zone V:
The areas of this zone have the highest risk of effects by an earthquake. The earthquake intensity for this zone is MSK-IX or greater. The zone factor for this zone is 0.36, which is indicative of effective (zero period) level earthquake in this zone. This zone is called as Very High Damage Risk Zone. Some of the regions which fall under this zone are Rann of Kutch, Eastern regions etc.
Difference between Intensity & Magnitude of Earthquake
Intensity is number written in Roman numeral describing the severity of the earthquake in terms of its effect on earth surface, and on human and their structure. The higher the number, the higher the intensity of the effect/damage. While magnitude indicates amount of energy released at the source i.e. epic center.
Intensity is measured as MMS (modified Meracallie Scale) while magnitude is measured on richter scale.
Zone VI:
The areas of this zone have the lesser risk to effects by an earthquake as compared to zone V. The earthquake intensity for this zone is between MSK VIII to MSK-IX. The zone factor for this zone is 0.24. This zone is called as High Damage Risk Zone. Some of the regions which fall under this zone are Northern regions, North Eastern regions, Delhi etc.
Zone III:
The areas of this zone have the lesser risk by an earthquake. The earthquake intensity for this zone is MSK VII. The zone factor for this zone is 0.16. This zone is called as Moderate Damage Risk Zone. Some of the regions which fall under this zone are some parts of Gujarat & Maharashtra, Andaman Nicobar Islands etc.
Zone II:
The areas of this zone have the least risk of an earthquake. The earthquake intensity for this zone is MSK VI. The zone factor for this zone is 0.10. This zone is called as Low Damage Risk Zone. Larger parts of India come under this zone.
One can see that in zone II, the intensity is VI on M scale while in zone V it is iX or greater, i.e. the damage and effect would be higher.
Hope this helps you.
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