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P- and S-Wave Reflection Seismic Imaging Using DAS and Nodal Receivers: an Example from Kurikka, Finland
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, NSG2023 29th European Meeting of Environmental and Engineering Geophysics, Sep 2023, Volume 2023, p.1 - 5
Abstract
Summary
To evaluate the feasibility of P- and SV-wave imaging of a complex groundwater system using there-component nodal receivers and a distributed acoustic sensing - DAS system, a 2D seismic survey was conducted. An electrically driven seismic vibrator operating in both P- and SV-wave mode was used as the source. Both raw receiver gathers and stacked seismic sections of the DAS data show presence of P-wave reflections from the P-wave mode source operation, with the stacked section showing discontinuous basement and a shallow seated reflector likely originating from the subsurface clay-sand/gravel contact. The P-wave DAS results are consistent with the vertical component data of the nodal receivers, but of lower quality. The S-wave stacked sections obtained from the source operating in the SV-wave mode for both DAS and radial component of the nodal receivers show consistent reflectors of the same quality. All results obtained suggest an undulating weathered bedrock topography controlling the conditions within the aquifer, consistent with borehole data indicating that, with adequate coupling, DAS using straight fiber optic cable is capable of recording both P- and S-waves.
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