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An unexplained seismic event ‘rang’ across the Earth in November
Someone who tracks earthquakes for fun noticed it first. On November 11, 2018, a Twitter user going by @matarikipax spotted a weird signal on the U.S Geological Survey’s live seismogram page. The signal had been captured by equipment in Kilimambogo, Kenya. Matarikpax posted an image of it with the message, “This is a most odd and unusual seismic signal.”
Normally, earthquakes produce “wave trains” comprised of high-frequency P (for “Primary”) waves that travel in pulses, as well as mid-frequency S (for “Secondary”) waves that wiggle side-to-side. Slow, low-frequency waves such as the mystery rumble are generally produced at the tail end of intense earthquakes, but again, there hasn’t been one anywhere in the right time frame that we know of.
Also, and just as “odd,” is that the wave is monochromatic. Most waves contain a cluster of waves at different speeds, or frequencies, that make for a fuzzy, complicated burst of a waveshape on monitoring equipment. The November wave was comprised of just a single frequency, and appeared as an unusually simple, clean zig-zag of about 17 seconds in length. Helen Robinson at the University of Glasgow, mischievously suggests to National Geographic, “They’re too nice; they’re too perfect to be nature.”
https://bigthink.com/hard-science/mystery-seismic-wave/
Strange waves rippled around the world, and nobody knows why
On the morning of November 11, just before 9:30 UT, a mysterious rumble rolled around the world. https://www.nationalgeographic.com/science/article/strange-earthquake-waves-rippled-around-world-earth-geology
https://twitter.com/ALomaxNet/status/1061637338709790721?s=20