JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Sonic event seismograms. Recordings, by 6 British Geological Survey sites in Cornwall, England, of the sonic event on 15 January 2002, over Devon, England. Vertical ground movement speed recordings were made by sensitive seismographs. The movement was produced when the sonic boom (from an aircraft or a meteor) impacted the ground. The shockwaves from the impact spread at 2-5 kilometres a second through the ground. The event occurred at 20:15 UTC (GMT). The six Cornish recording sites (from top) are: Rosemanowes' second station, Goonhilly, Stithians, Budock Water, Gweek and Manaccan.
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