Usage History of 'seismal'

The following chart shows how frequently 'seismal' appeared in printed materials over time. For example, the word 'seismal' occurred 2 times in books in 1853 and 36 times in 2008. From 1853 to 2008, the word 'seismal' was used a total of 737 times in books scanned by Google. See Reference: Google Ngram project.

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