Measuring the size of an earthquake

Earthquake Information Bulletin (USGS)
By: , and 


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Today, state-of-the-art seismic systems transmit data from the seismograph via telephone line and satellite directly to a central digital computer. A preliminary location, depth-of-focus, and magnitude can now be obtained within minutes of onset of an earthquake.  The only limiting factor is how long the seismic waves take to travel from the epicenter to the stations--usually less than 10 minutes.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Measuring the size of an earthquake
Series title Earthquake Information Bulletin (USGS)
Volume 21
Issue 1
Year Published 1989
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 6 p.
First page 58
Last page 63