Usage History of 'moonquakes'

The following chart shows how frequently 'moonquakes' appeared in printed materials over time. For example, the word 'moonquakes' occurred 6 times in books in 1876 and 139 times in 2008. From 1876 to 2008, the word 'moonquakes' was used a total of 10,898 times in books scanned by Google. See Reference: Google Ngram project.

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