This is a most odd and unusual seismic signal.
Recorded at Kilima Mbogo, Kenya ...
#earthquakehttps://earthquake.usgs.gov/static/earthquake-network-operations/Seismic_Data/telemetry_data/KMBO_24hr.html…
First guess would be some kind of meteor air burst, possibly offshore Kenya/Tanzania in the Indian Ocean. Would be useful to see the signal in Asia if possible
The earlier signal there looks to be the M4.5 India-Nepal quake, followed by the M5.5 Indonesia quake. So that gives an idea. The signal is clearly not of a seismic origin, so it has to be something else, hence my first thought was a meteor of some kind.
Fair call.
Some kind of extraterrestrial electromagnetic shock wave may be worth thinking about, or some previously unknown to me oscillatory mechanism perhaps involving a complex electromagnetic component at great depth.
It is strange.
As an update for you, further investigation lends itself to the suggestion of a submarine volcanic event, possibly near the island of Mayotte, between Madagascar & Tanzania/Mozambique. If this is the case it must have been a massive volcanic event, albeit in very deep ocean.
I've managed to narrow down the origin area to somewhere near Madagascar (earliest arrival I've found is there at 09:31 UTC). Could be meteor or, due to relative proximity, related to Reunion volcano (far less confident)
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No extraterrestrial shock wave was measured.
The seismic event was found to be below the ocean floor in deep water by seismic analysis.
We don't have a good location for the 16s period signal as traditional seismological techniques don't work on such waves