Author :

Posted On :
The magnitude of an earthquake is a measure of its size. For instance, one can measure the size of an earthquake by the amount of strain energy released by the fault rupture.

**Basic difference: magnitude versus
intensity**

The magnitude of an
earthquake is a measure of its size. For instance, one can measure the size of
an earthquake by the amount of strain energy released by the fault rupture.
This means that the magnitude of an earthquake is a single value for a given
earthquake; on the other hand, intensity is an indicator of the severity of
shaking generated at a given location – clearly, the severity of shaking is
much higher near the epicentre than further away. Thus, during the same
earthquake of a certain magnitude, different locations experience different
levels of intensity.

To elaborate these
distinctions consider the analogy of a boiler. The temperature at a location
near the boiler is higher than that further away from it (see Fig. 16.10). When
the boiler releases 100 watts of energy, the temperature at a location depends
on the energy of the boiler and its distance from the boiler. Hence the wattage
of the boiler is like the magnitude of an earthquake and the temperature at a
location is like the intensity of shaking at that location.

Tags : Civil - Structural dynamics of earthquake engineering

Last 30 days 118 views
Recent New Topics :