4 ms·

This has been known for a while. Seismologists discovered it and tracked one at 5000 MPH. The ability to be anywhere in the world in a very short time is a comp

by AmVess 9y ago

This has been known for a while. Seismologists discovered it and tracked one at 5000 MPH. The ability to be anywhere in the world in a very short time is a compelling tool for the military.

thatcherc 9y ago
Can you elaborate on that? I'd be very interested to see how seismologists tracked a plane. Can you pick up high-altitude shockwaves from seismographs?
- vpribish 9y ago
  1992: 4,000mph, Los Angeles http://articles.latimes.com/1992-04-17/local/me-607_1_spy-plane http://articles.latimes.com/1992-04-17/local/me-607_1_spy-pl... USGS on seismographs and sonic booms generally: https://earthquake.usgs.gov/learn/topics/sonic-booms.php https://earthquake.usgs.gov/learn/topics/sonic-booms.php