📖 what
What is a foreshock?
EarthquakesSeismology
Quick Answer
A foreshock is an earthquake that happens before a larger quake in the same area, though it is only identified as one afterward.
The Full Story
Foreshocks are smaller events that occur before the main shock on the same fault or nearby faults. The tricky part is that you usually cannot know an earthquake is a foreshock until a larger earthquake follows. Because of that, most small quakes are not foreshocks at the time they occur. Studying foreshocks can help scientists learn how stress builds before major rupture.
Key Facts
1.A foreshock is recognized only in hindsight
2.It precedes a larger earthquake in the same region
3.Not every mainshock has foreshocks
YouTube Angle
Suggested video title for this topic:
"The tiny quake that may be a warning — but only after the fact"