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Tremor activity monitoring in northern Cascadia; Kao, H; Thompson, P J; Shan, S -J; Rogers, G; Dragert, H; Spence, G. Eos,
Transactions of the American Geophysical Union vol. 89, no. 42, 2008 p. 405-406,
https://doi.org/10.1029/2008eo420001 
Open Access (ESS
Cont.# 20080016)