>>6108374 lb
We're thinking along the same lines.
Stepped away to brush my teeth and an possible answer, for consideration by physicsanons, popped into muh mind.
Suppose there are two widely spaced transmitters.
Suppose they transmit a signal of equivalent power, on the same frequency, aiming at a specific point on earth.
Let's say that target zone is Mayotte.
Wait – suppose the frequency is just every so slightly detuned, such that the two converging signals beat?
(Anons familiar with the phenomenon of beating? Radio anons know it well, music/audio/acoustics anons may also be familiar – see sidebar below.)
Troughs destructively combine, peaks constructively combine, such that a new much lower frequency is observed in the target zone.
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sidebar on beats
In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies.
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Anon, are you following me?
Without knowing the fundamental frequency transmitted, we can't say exactly how far detuned the two signals would have to have been, to produce what was observed at/from/in the vicinity of Mayotte.
If the power levels were strong enough, and the detuning was precise, I believe this phenomenon could have produced physical vibrations of significant magnitude … which conventional instruments would have interpreted as "seismic" since that's the paradigm surrounding those types of sensors and recording instruments.
Really powerful physical vibrations converging on a particular spot …
Does anybody remember what Defense Secretary William Cohen said in 1997?
Full transcript here → http://archive.defense.gov/Transcripts/Transcript.aspx?TranscriptID=674
About 2/3 of the way down Cohen said,
"Others are engaging even in an eco- type of terrorism whereby they can alter the climate, set off earthquakes, volcanoes remotely through the use of electromagnetic waves."
Cohen was alluding to such a capability existing prior to 1997.