Passive Seismic Three-Component Interferometry Experiment at the Kylylahti Mine Site, Eastern Finland

Summary Recent theoretical advances have demonstrated that passive surveys utilizing ambient seismic noise allow new possibilities for seismic imaging and may provide an alternative for controlled-source surveying. Related to the COGITO-MIN project, a passive seismic experiment employing a set of 45 three-component seismometers recording for about 30 days was conducted in the Kylylahti polymetallic mine area in Eastern Finland. Acoustic forward modelling was carried out to get an idea on how well the reflections could be retrieved with seismic interferometry. Three-component data allows to determine all nine components of the Green’s tensor. For this work, one day of passive recordings were used to retrieve Green’s function for the vertical and transverse component of the geophone lines. There are events in the vertical component panel that can be attributed to the impedance contrast between the host rocks of the mineralisation and its surroundings. The transverse component panel exhibits similar sparse reflectivity, but is lacking coherence of the reflections.