Last modified on October 8, 2007, at 19:39

Foreshocks

Small foreshocks on a seismic record.
Foreshocks are relatively smaller earthquakes that precede the largest earthquake in a series, which is termed the mainshock. Not all mainshocks have foreshocks.[1]


References

  1. ↑ http://earthquake.usgs.gov/learning/glossary.php?term=foreshocks