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Vaibhav Singh posted an Question
April 03, 2021 • 20:14 pm 30 points
  • IIT JAM
  • Geology (GG)

At the present times , earthquakes are normally measured by the modified mercalli scale .this scale determines the------

Given Answer in book is B. (Objective intensity of the quakes with the epicentre). ..But why ? It should be subjective intensity because it is just based on experience of people and other things. If I assume for a while that it is given in answer Objective Intensity because Mercalli Scale also has numbers from 1 to 12 (roman). then Answer could be Option D. Why option B is given ??? Is it correct or wrong??

3 Answer(s) Answer Now
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    Shailesh Chaudhary Best Answer

    Intensity of an earthquake is a subjective measure of the force of an earthquake at a particular place as determined by its effects on persons , structures , and earth materials. the intensity at a point depend not only upon the strength of the earthquake (i. e magnitude) but also upon the distance from the earthquake to the point and the local Geology at that point. while the intensity decreases with the distance from the epicenter , magnitude for an earthquake remains the same , irrespective of where it is measured

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    Shailesh Chaudhary best-answer

    according to me the correct answer should be A i. e subjective intensity of the quake with the epicenter

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    Shailesh Chaudhary best-answer

    we use the Modified Mercalli (MMI) Scale. The Mercalli Scale is based on observable earthquake damage. From a scientific standpoint, the magnitude scale is based on seismic records while the Mercalli is based on observable data which can be subjective. Thus, the magnitude scale is considered scientifically more objective and therefore more accurate. For example a level I-V on the Mercalli scale would represent a small amount of observable damage. At this level doors would rattle, dishes break and weak or poor plaster would crack. As the level rises toward the larger numbers, the amount of damage increases considerably. Intensity X (10) is the highest value on the MMI.

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    So, according to you which option is correct...

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