In earthquakes most of the energy is released by the mainshocks (first quake). The rest of the energy is released by the following weaker aftershocks that may or may not be felt by humans.
In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousands of instrumentally detectable aftershocks, which steadily decrease in magnitude and frequency according to known laws. In some earthquakes the main rupture happens in two or more steps, resulting in multiple main shocks. These are known as doublet earthquakes, and in general can be distinguished from aftershocks in having similar magnitudes and nearly identical seismic waveforms.
Mainshocks are followed by the much weaker aftershocks. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered.
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