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Spectrogram and waveform of a possible long-period earthquake in Yellowstone

By Yellowstone Volcano Observatory February 2022 (approx.)
Spectrogram and waveform of a possible long-period earthquake in Yellowstone that occurred on August 26, 2021, near Norris Geyser Basin
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Detailed Description

Spectrogram of a possible long-period (LP) earthquake in Yellowstone that occurred on August 26, 2021, near Norris Geyser Basin.  The top panel shows a 30-second seismogram recorded at seismic station YHH.  The bottom panel shows the spectrogram with energy concentrated in the 1–3 Hz range and lasting for ~15 seconds.

Sources/Usage

Public Domain.