Geophysicist at the Royal Netherlands Meteorological Institute (@KNMI) 
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Space rock skims Earth’s atmosphere, observed by the #globalmeteornetwork
In the early hours of 22 Sept over N. Germany & the Netherlands, a meteoroid got down to 91 km in altitude - far below orbiting satellites - before it ‘bounced’ back into space
https://www.esa.int/ESA_Multimedia/Images/2020/09/Lucky_meteoroid_skims_Earth_s_atmosphere …pic.twitter.com/lSG59OrQj9
The #infrasound stations of @KNMI also detected low-frequency inaudible sound from this event all over the Netherlands. It took the sound wave 5 minutes to reach the Earth surface. The waveforms suggest a high altitude meteor shock. @pgbrown @dannycbowmanpic.twitter.com/dTJjE7BKxT
The shock wave also coupled to the ground. Multiple seismic phases can be observed down to 120 m depth. The figure shows recordings at a seismo-acoustic array. The top trace is infrasound, the bottom four traces show the vertical motion measured at 30, 60, 90 and 120 m depth.pic.twitter.com/5Cg7MznmRl
What are the horizontal axis units? Seconds?
Just saw this exact plot in #AwayNetflix @netflix
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