File:Digital seismogram.png

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A seismogram. :The record from station HFP (Fremont Peak; 9 miles SW of Hollister, 18 miles SSE of Gilroy; 36.754, -121.492) is shown below. The closeness in time and location of these earthquakes to each other is no coincidence. Earthquakes "interact", meaning that the stress changes produced by one earthquake can encourage others to occur nearby, thereby producing clusters of events. The most common form of cluster is the main shock and its aftershocks, the main shock being first and having the largest magnitude. When an earthquake (like the M=1.7 event here) triggers a larger earthquake (the M=3.3 event here), the first is called a "foreshock".

Source

Taken from http://quake.wr.usgs.gov/recent/helicorders/Examples/Fore_main_after.html

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This image is a work of a United States Geological Survey employee, taken or made as part of that person's official duties. As a work of the United States Government, the image is in the public domain in the US. For more information, see the USGS copyright policy. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.