  Sources of geophysical noise, such as wind, sea waves and earthquakes, can
have an impact on gravitational wave interferometers causing sensitivity
worsening and gaps in data taking. During the 1-year long O3 run (April 1st
2019 to March 27th 2020), the Virgo Collaboration collected a statistically
significant dataset to study the response of the detector to a variety of
environmental conditions. We used these data to correlate environmental
parameters to global detector performance, such as observation range, duty
cycle and control losses. Where possible, we identified weaknesses in the
detector and we elaborated strategies to improve Virgo robustness against
external disturbances for the next run O4, planned to start in summer 2022. In
this article we present preliminary results of this study.
