Asked by Amanda

what is a seismograph and how does it work?

what other methods do scientist use to measure earthquakes
Answered by Ms. Sue
http://science.howstuffworks.com/question142.htm

http://tremor.nmt.edu/faq/how.html

http://pubs.usgs.gov/gip/earthq1/measure.html

http://earthquake.usgs.gov/learning/topics/measure.php
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