Interaction of Air Pressure and Groundwater as Main Cause of Sub‐Daily Relative Seismic Velocity Changes

Abstract Our study investigates variations of seismic velocity that occur over short time scales hours. We use coda wave interferometry to inspect 5 months continuous data from a seismological array in southern Germany. This results relative velocities ( dv/ v ) show temporal on the order 10 −4 . Spectra series contain strong daily and sub‐daily behavior indicating changes are primarily caused by atmospheric tides. also note influence temperature variations, but as second‐order effect. The explanatory model focuses depth groundwater table, linking pressure (loading de‐loading Earth's surface) velocity. highlight an important environmental needs be considered before can used for inspecting fluid stress situ.