* PRELIMINARY *

Taking advantage of the UPS work at WEB (mains shutdown), we can compare the seismic, acoustic and magnetic noise levels of WEB (in purple all OFF, in blue standard conditions).

There is a huge difference in the triaxial magnetic fluxgate near the vacuum tank (ENV_WE_MAG_x), it seems that we have reached the sensor noise floor. To be further investigated.

Another interesting difference is the ALS microphone noise level (ENV_WE_ALS_MIC) for frequencies above 2 kHz.

HVAC was left always ON

* MORE DETAILED ANALYSIS WILL FOLLOW *