Попробуйте следующее:
> d1 <- c("CCA: 135 cm/sec ICA: 50 cm/sec", "CCA: 150 cm/sec ICA: 75 cm/sec")
> t(strapplyc(d1, "\\w+: \\S+ \\S+", simplify = TRUE))
[,1] [,2]
[1,] "CCA: 135 cm/sec" "ICA: 50 cm/sec"
[2,] "CCA: 150 cm/sec" "ICA: 75 cm/sec"