I. Hamama

I. Hamama

he/him

Researcher with 12+ years in seismic & infrasound data processing. Postdoctoral Fellow at National Center for Physical Acoustics, University of Mississippi.

Announcing SeismoFK: Open-source FK Array Analysis for Infrasound Data

2 minute read

Published:

Today I’m releasing SeismoFK — an open-source desktop application for frequency–wavenumber (FK) array analysis of infrasound array data.

DOI

If you read my earlier post on the Artemis II Orion capsule re-entry detection, this is the tool that produced that analysis — beamforming, back-azimuth, slowness, and the multi-panel result figure all came out of SeismoFK.

What SeismoFK does

SeismoFK is a PyQt5 desktop application that runs sliding-window FK array analysis on infrasound array data and reports, for each time window:

  • Semblance (0–1 coherence measure)
  • Fisher ratio
  • FK power
  • Back-azimuth
  • Apparent (trace) velocity / slowness

It also forms a delay-and-sum beam steered to the dominant detected direction, compares the measured back-azimuth against an expected source direction, and archives classified events in a local SQLite database.

Features

  • Load MiniSEED waveforms from infrasound or seismic arrays
  • Automatic station inventory loading from FDSN StationXML; auto-discovers all inventories in XML/ or XML_IM/
  • XML Creator / Editor to define custom array stations interactively
  • convert_ims.py CLI to split a single CTBTO/IRIS all_IMS_sts.xml into per-station files
  • Interactive waveform viewer with band-pass preview and time picking
  • Spectrogram window for time–frequency inspection of every array element (new in this release)
  • Sliding-window FK analysis with user-tunable bandpass, window length, overlap, and semblance threshold
  • Local event database with classification, notes, filter, CSV export
  • Auto-saved per-event result figure + CSV table

Screenshots

SeismoFK main analysis window The main analysis window — inventory selection, FK parameters, waveform preview, and the bottom tools row.

SeismoFK spectrogram window Spectrogram window — PSD for every channel of the array, with in-window controls to retune the bandpass and recompute on the fly.

FK analysis result for the Artemis II re-entry FK analysis result for the Artemis II Orion capsule re-entry detection — produced by SeismoFK from raw I57US waveforms.

Get it

Station XML data is not bundled — IMS infrasound metadata is subject to CTBTO/IRIS distribution policies. The README documents how to supply your own (via convert_ims.py or the built-in XML Creator).

Citation

If you use SeismoFK in your research, please cite it. GitHub auto-renders CITATION.cff as a “Cite this repository” button, or you can cite directly:

Hamama, I. (2024–2025). SeismoFK: Open-source FK array analysis for infrasound and seismic data. Zenodo. https://doi.org/10.5281/zenodo.20301796

Acknowledgements

The array-processing methodology in SeismoFK is adapted in part from work by Jelle Assink (KNMI) — see the ROSES 2021 array-processing material.

Feedback, bug reports, and feature requests are welcome — please open an issue on the GitHub repo or reach out: islam.hamama@nriag.sci.eg.

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