What Is an Aftershock?
Earth isِ anِ active place full ofِ storms, fast-moving river andِ ocean currents, volcanoes, andِ earthquakes.
Continents areِ slowly butِ constantly moving, andِ the stresses thatِ build upِ inِ the rocks thatِ stem fromِ pushing, pulling, andِ twisting forces eventually result inِ the sudden violent fracturing ofِ the rocks.
Aftershock isِ the term usedِ toِ describe a shaking event thatِ followsِ anِ earthquake.
Aftershocks areِ themselves earthquakes, butِ they areِ more accurately describedِ asِ the lower-magnitude (or lower-intensity) tremors thatِ follow theِ principal earthquake orِ main shock (that is, theِ largest earthquake inِ a sequence ofِ earthquakes).
When anِ earthquake occurs someِ ofِ the energy released fromِ the sudden fracturing ofِ rock isِ transferred toِ theِ rocks nearby, whichِ adds toِ theِ pushing, pulling, andِ twisting stresses alreadyِ placed onِ them.
In thisِ way, earthquakes beget aftershocks, andِ aftershocks beget smaller-and-smaller aftershocks.