SeedPSD: a web service for analyzing seismological station noise levels

We introduce SeedPSD, a web service designed to visualize precomputed Power Spectral Densities (PSDs) as PDFs and spectrograms. SeedPSD was initially deployed at the Epos-France EIDA node and has since been deployed across 12 nodes as of 2025.

PSDs are routinely employed to characterize seismological station sites and perform data quality control. Furthermore, seismic noise is now widely used for tomography, crustal monitoring, and investigating ocean-solid Earth coupling. An efficient means of retrieving or plotting spectrograms and PDFs for a given site is valuable for identifying stations that have recorded specific noise events (such as oceanic storms) and, more broadly, for understanding the noise wavefield.

Looking ahead, we are considering proposing jointly with Earthscope a new FDSN standard for a PSD web service. This service would enable users to access PSDs, as well as PSD-derived spectrograms and Probability Density Functions (PDFs), computed from continuous seismic data. This initiative is supported by EIDA, EarthScope, and Geo-INQUIRE.