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Gibbons Steven J.

Institute:
NORSAR

TEMPORAL VARIABILITY OF INFRASOUND PROPAGATION AND DETECTABILITY IN THE EUROPEAN ARCTIC

Authors: SJ Gibbons (NORSAR), SP Näsholm (NORSAR), T Kvaerna (NORSAR), M Blixt (NORSAR)
The European Arctic makes an excellent laboratory for the study of infrasound propagation given numerous infrasound arrays and many repeating sources of infrasound. We have compiled an extensive database of repeating, seismically constrained, Ground Truth explosions including many thousands of events and spanning almost 30 years. For each explosion, we include parametric descriptions of the infrasonic wavetrain observed at each available station. Non-detection is also a key observation for an event-station combination. Paths cover distance ranges from a few tens of kilometers to many hundreds of kilometers, an exceptional range of azimuthal directions, and observations exist for all times of year. We display and discuss changes in infrasound propagation for tropospheric, stratospheric and thermospheric phases over time-scales from days to seasons and from year-to-year.

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