GEOLOGY

Detailed explanation-1: -Aftershocks are smaller earthquakes that occur in the same general area during the days to years following a larger event or “mainshock.” They occur within 1-2 fault lengths away and during the period of time before the background seismicity level has resumed.

Detailed explanation-2: -When a relatively large earthquake occurs, a series of smaller earthquakes will follow continuously around the epicenter of the first earthquake. We call this first large earthquake “mainshock” and the subsequent “aftershocks”. This occurrence pattern of seismic activity is called as “mainshock-aftershock type”.

Detailed explanation-3: -Sometimes an earthquake has foreshocks, smaller earthquakes that happen in the same place as the larger earthquake that follows. The largest, main earthquake is called the mainshock. Mainshocks always have aftershocks that follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock.

Detailed explanation-4: -"In any earthquake, a certain amount of stress is released, but in large earthquakes not all the stress is released in one earthquake and then each and every aftershock releases more and more stress. And that is why, for any major earthquake with a large fault, many, many aftershocks will follow, ” she said.

Detailed explanation-5: -But what is the difference? The difference is in the intensity of the quake. The initial quake always has the greatest power, or magnitude, as defined by the Richter scale. Aftershocks are smaller quakes that then occur in the general area after the main quake.