Why do earthquakes have aftershocks? Kuya Kim explains

Whenever an earthquake occurs, authorities warn of possible aftershocks following the first shake.

Aftershocks are smaller earthquakes that come after strong earthquake, but why do they happen at all?

According to Kuya Kim on Thursday's "24 Oras," this is because the earth's crust is still adjusting to the effects of the initial earthquake.

Rocks near the epicenter or around the fault which caused the earthquake can still move and trigger aftershocks.

As of 11 a.m. on Thursday, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) recorded 828 aftershocks after the magnitude 7.0 earthquake hit Abra on Wednesday morning.

PHIVOLCS said aftershocks are expected to continue for several weeks.

—MGP, GMA News