Yesterday/Today there were periods of steady wind from 12 to 18mph with very occassional gusts to 25 and later calm conditions.  Richard has got the wind sensors all set so as I'm looking at STS performance, why not.  The wind tends to be from the SE to E (-X to edit [-]X-Y) edit [these are the variable wind  from directions; the winds are travelling toward the NW/W] during this wind; the winter winds don't always follow our SW typical direction.

The four attached plots show ASDs for the four operational STSs during the windy period, ~2100utc 8 Feb for about an hour (thinck pale reference traces;) and, during the calm, ~0800utc 9 Feb (thin dark current traces.)  I will only comment on the low frequencies below the secondary useism, 0.16Hz.

During the calm, the pronouced bump at 60mHz is very evident; I was going to call this the Primary useism but isn't that 0.085Hz?  Anyway, with even this relatively moderate breeze (for LHO,) the affect on the seismometers is dramatic: Except for the fortunate ITMY, this 60mHz bump is buried on the X Y signals. 

For the Z DoF, all the sensors show similar amplitudes and are unaffected by the wind, except ETMY, departing from the calm spectra below 55mHz and increasing by an order of magnitude at 10mHz.  Is this real? The wind at EndY is more directly from the SE (-X) where the other buildings are hit more with an E wind.  At EndX the wind is a steady 18mph compared to the EndY 12mph and edit[ ETMX] does not see theis Z channel affect.  Could it actually be the building edit [or] ground conditions?

Also at EndY, the X DoF wind affect is much larger than all the other locations departing from the calm ASD at nearly the useism bump.  At 10mHz, it is nearly an order of magnitude above the next lowest DoF (ETMY_Y) and nearly 2 above ITMY.   Does this, combined with the response of the Z channel implicate the health of the ETMY instrument?  Little speculative to compare given the relative locations but could the HAM2 instrument be better than the ETMY?  I really don't want to think that as so many past examinations have implicated HAM2's health.