β why
Why do earthquakes often happen in aftershock sequences after the main shock?
ScienceEarthquakes
Quick Answer
The main earthquake changes stress on nearby faults, and the crust keeps adjusting as it settles into a new balance.
The Full Story
A large earthquake does not instantly make the crust stable. When the main fault slips, it redistributes stress to surrounding rocks and nearby faults, which may then fail in smaller quakes called aftershocks. Aftershock sequences can last days, months, or even years depending on the size of the original event. For example, the 2011 TΕhoku earthquake in Japan was followed by thousands of aftershocks as the region adjusted to the massive rupture.
Key Facts
1.Aftershocks are caused by stress redistribution
2.The 2011 TΕhoku quake had thousands of aftershocks
3.Large quakes can trigger long aftershock sequences
YouTube Angle
Suggested video title for this topic:
"Why does the Earth keep shaking after a big quake?"