According to the authors, their findings show
...the dominant spectral field powers entails a constellation of large low-frequency delta activity at the prefrontal area, much smaller theta activity at fronto-central area, alpha-1 activity at the anterior-posterior area, alpha-2 and beta-1 at the posterior area, and high-frequency beta-2 and gamma activities at the prefrontal area. Compared to the eyes-open resting state, the delta field power is enhanced at the prefrontal area while the theta, alpha-1, alpha-2 and beta-1 powers are reduced in the respective areas. Greater inter-individual variability in field power can be seen in the eyes-closed than the eyes-open state. In the eyes-closed state, the prefrontal delta field power is correlated with both beta-1 and gamma field powers, while these two high-frequency field powers are mutually correlated at the same area.
This study provides a useful reference point for understanding what the DMN looks like in terms of EEG, and, in particular, the findings can be useful in interpreting the fMRI and EEG studies of what occurs in meditation.
Chen, A. C., Feng, W., Zhao, H., Yin, Y., & Wang, P. (2008). EEG default mode network in the human brain: spectral regional field powers. Neuroimage, 41(2), 561-574.