We have made significant improvements to our low frequency sensitivity since I last put a coarse Newtonian noise estimate on the same plot as DARM, back in 2015 (alog 22113) so this is an update to that plot.  The highest level conclusion is that Newtonian noise is still more than a factor of 10x below our current DARM sensitivity, for both H1 and L1.  It turns out it's about a similar factor of 25x below DARM at both H1 and L1. 

In the attached plot I show the GDS-CALIB_STRAIN_CLEAN channel for both H1 and L1.  I also show an estimate of the Newtonian noise at each of H1 and L1 (after Jim helped me find a missing 1/(2*pi) - thanks Jim!).  Since this NN estimate comes entirely from an average of our ground seismometers (1 per building), we expect that this has not changed much now vs. back in 2015, and indeed it doesn't.

In the attached notebook (download, remove the .txt and make sure it has .ipynb, and then run it), the final plot shows that indeed Jan's estimate of NN from T1500284 matches the estimate I get with more recent seismic data.   As Jan noted back in 2015, to do a more proper estimate, we need to look at an array of sensors, but this is a fine coarse-grained estimate to show that NN is not responsible for our noise limitations at this time.