 |
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
World Meteorological Organization-Official City Weather Forecasts |
|
|
|
|
|
 |
|
 Modified Mercalli Scale
The Modified Mercalli Scale (MMS) gives
an indication of the intensity of an earthquake while the Richter Scale refers
to its magnitude.
The intensity of an earthquake at a
particular locality is a measure of the violence of earth motion produced there
by the earthquake. It is determined from reported effects of the tremor on human
beings, furniture, buildings, geological structure etc. Unlike the magnitude
which has a unique value for a particular earthquake, the intensity of an earthquake
at a place depends on the distance of that place from the epicentre, the depth
of the focus, the intervening and local earth structures and the type of fault
motion that caused the earthquake. Many places, including Hong Kong, have
adopted the Modified Mercalli Intensity Scale (MM) which classifies earthquake
effects into twelve grades.
|
 |
|
|
|