They are quite common; they are called aftershocks. An earthquake redistributes the stress that creates the quake across the fault line, which then creates new points of stress, which result in additional earthquakes, which further redistribute the stress again, and so on and so forth until all the energy is spent.
Because often times in an earthquake, gas may leak from pipes, as everything is getting destroyed and falling apart after a very strong earthquake.
According to USGS National Earthquake Center approximately 15 earthquakes of magnitude 7.0 - 7.9 occur per year around the world. This is based on the earthquake facts and statistics collected by USGS since 1900.
Almost every year and many times in a year itself but A big earthquake is expected about every 70 years. like 1923, 1955, 2011!
Actually, earthquakes occur several hundred times a day worldwide. However, these are magnitude of 2 or lower, so they are not felt.A magnitude of 7 earthquake happen at least once a month somewhere in the world.
A 9.0 earthquake is 100 times larger in magnitude than a 7.0 earthquake on the Richter scale. This means that the amplitude of ground motion and energy release is significantly higher in a 9.0 earthquake compared to a 7.0 earthquake.
100 times
2-5 times per year
2 times
30 times more energy released. 10 times more ground motion*
A 7.0 earthquake is much stronger and more destructive than a 5.0 earthquake. The energy released by a 7.0 earthquake is about 1,000 times greater than that of a 5.0 earthquake. This means that a 7.0 earthquake can cause more severe damage to buildings and infrastructure.
place de la Concorde is often visited about 8,554,746 times or more
100 times larger