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Measuring the size of an earthquake

Earthquake Information Bulletin (USGS)
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Abstract

Earthquakes occur in a broad range of sizes. A rock burst in an Idaho silver mine may involve the fracture of 1 meter of rock; the 1965 Rat island earthquake in the Aleutian arc involved a 650-kilometer lenght of Earth's crust. Earthquakes can be even smaller and even larger. if an earthquake is felt or causes perceptible surface damage, then its intesnity of shaking can be subjectively estimated. But many large earthquakes occur in oceanic area or at great focal depths. These are either simply not felt or their felt pattern does not really indicate their true size. 

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Measuring the size of an earthquake
Series title Earthquake Information Bulletin (USGS)
Volume 9
Issue 4
Year Published 1977
Language English
Publisher U.S Geological Survey
Description 3 p.
First page 21
Last page 23
Online Only (Y/N) N
Additional Online Files (Y/N) N