File:Four-types-seismograms.gif

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	00:02, 1 January 2009		639 × 734 (18 KB)	Eeekster	{{Information \|Description={{en\|1=Four major types of seismograms, or "seismic signatures," are recognized from seismometers in the vicinity of Mount St. Helens.}} \|Source=http://vulcan.wr.usgs.gov/Glossary/Seismicity/description_seismic_monitoring.html \|

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