GEOLOGY

Detailed explanation-1: -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: -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-4: -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-5: -A foreshock is a smaller quake that occurs prior to the mainshock. Foreshocks are not as strong as mainshocks. For example, if two quakes are measured on a seismograph at a 3.8 and 4.6, the 3.8 quake would be a foreshock and the 4.6 would be the mainshock.