= How are earthquakes detected by British Geological Survey
{c}
{tag=Work by British Geological Survey}
https://www.bgs.ac.uk/discovering-geology/earth-hazards/earthquakes/how-are-earthquakes-detected/
Institutional page headed “How are earthquakes detected, located and measured?”. Its <seismic wave> table lists typical crustal P and S speeds, and its location discussion explains the use of phase arrival delays. Those generic values are not a measured Swiss <velocity model>.
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