I would say a big earthquake is 4.0 or bigger
It depends on how big the earthquake is. A big earthquake will cause more damage to the area.
earthquake aftershocks
The proper subject is "earthquake", its whole group is "A big earthquake".
The last big earthquake in Japan was on March 11, 2011
they are like little earthquakes after a big earthquake
The earthquake was 7.8 magnatude
There was a big earthquake in 2010 in Haiti. The earthquake was 7.0
the annual cost of an earthquake depends on how big was the earthquake
That earthquake measured 7.0 mw on the Richter scale, making it extremely big.
It depends on how big the earthquake is and how close you are to the epicenter
it was about 8.0.
6.7M