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High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

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Table App 4.1: Twelve levels <strong>of</strong> Modified Mercalli intensity<br />

MAGNITUDE VS INTENSITY (AN ESTIMATE)<br />

The Intensity generated by earthquake at epicenter is highest and causes maximum<br />

destruction. The intensity is also associated with peak ground acceleration (PGA)<br />

which is more useful parameter for structural design and effect <strong>of</strong> earthquake.<br />

The earthquake hazard is estimated by the intensity <strong>of</strong> earthquake felt at a given site<br />

generated from the earthquake. The earthquake magnitude measured in ML, MB,<br />

MS and MW, where as earthquake intensity is measured in modified mercalli<br />

intensity <strong>scale</strong> or peak ground acceleration felt at epicenter and away from epicenter.<br />

The empirical relationship/estimate <strong>of</strong> earthquake magnitude, intensity and PGA is<br />

given below<br />

Richter Magnitude<br />

Typical Maximum Intensity at<br />

Epicenter in Modified Mercalli<br />

Intensity Scale<br />

Peak Ground<br />

Acceleration (m/s2)<br />

1.0 - 3.0 II 0- 0.2<br />

3.0 - 3.9 III 0.2-0.4<br />

4.0 - 4.9 V 0.4-0.8<br />

5.0 - 5.9 VII 0.8-2.4<br />

6.0 - 6.9 IX 2.4-3.2<br />

7.0-7.9 X 3.2-4.0<br />

8.0+ X+ 4.0+<br />

Table App 4.2: Estimate <strong>of</strong> earthquake magnitude, intensity and PGA<br />

33

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