GEOLOGY

Detailed explanation-1: -"Foreshock” and “aftershock” are relative terms. Foreshocks are earthquakes that precede larger earthquakes in the same location. An earthquake cannot be identified as a foreshock until after a larger earthquake in the same area occurs.

Detailed explanation-2: -Aftershocks can continue over a period of weeks, months, or years. In general, the larger the mainshock, the larger and more numerous the aftershocks, and the longer they will continue. Foreshocks are relatively smaller earthquakes that precede the largest earthquake in a series, which is termed the mainshock.

Detailed explanation-3: -Foreshocks arise from rough faults One leading theory proposes that foreshocks result from an acceleration of slipping movements along a fault. This movement, known as aseismic slip, triggers small earthquakes as it extends across ever-larger areas of the fault and speeds up.

Detailed explanation-4: -This means that there is about a 94% chance that any earthquake will NOT be a foreshock. In California, about half of the biggest earthquakes were preceded by foreshocks; the other half were not.