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and here at Lusaka, Zambia ... earthquake.usgs.gov/static/earthqu

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and at Mt. Furi, Ethiopia ... earthquake.usgs.gov/static/earthqu

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San Pablo, Spain ... earthquake.usgs.gov/static/earthqu

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and here in Wellington, New Zealand ... earthquake.usgs.gov/static/earthqu

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The signal can be seen all around the world at this URI, but only for the day. earthquake.usgs.gov/monitoring/ope

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It looks like two or more frequencies mixed ...

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Narrowing the location down the origin area appears to be in the region of the Comoros/Mayotte. A news article today suggests that the Mayotte swarm which began earlier this year may indeed be magmatic-related. Was this event a submarine volcanic eruption? lejournaldemayotte.yt/seismes-carte-

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@ALomaxNet

Replying to @ALomaxNet and @UKEQ_Bulletin

SBV, like the other stations, shows long monochromatic signal with ~17s period (mono-freq Rayleigh waves?). But filtered above 1Hz SBV (lower plot) also shows seismic(?) signals from repeating sources, with some ~50s apart. Maybe some large, shallow, oscillating volcanic source?

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Replying to @UKEQ_Bulletin @SquigglyVolcano and 6 others

What is interesting is that a similar signal to today's cannot be seen for the Havre event in 2012 at Raoul Island or East Cape in New Zealand, as would be expected. I have no idea if a similar global signal of this nature has ever been observed.

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Dr Robin George Andrews

@SquigglyVolcano