Talk:2219: Earthquake Early Warnings
Earthquake early warning works mostly because the sensors are closer to the epicenter than the victims. The warning is transmitted at the speed of light (radio in this case) which is much faster than the earthquake waves. So the warning arrives first at a distant victim. The difference in speed of the various earthquake waves has little to do with it. The interpretation of cueballs remarks is over reaching.18.104.22.168 20:53, 23 October 2019 (UTC)
- Wikipedia disagree with you saying that you might get a warning from a few seconds to more than a minute just based on P-waves which move faster than S-waves. Have added this link to the description. --Kynde (talk) 21:26, 23 October 2019 (UTC)
Anyone else think this drawing is weirdly grey compared to other recent ones? - Anonymous (how edgy!) 22:21 23 October 2019 (UTC)
That's why I don't use the bun spoiler app. --22.214.171.124 23:16, 23 October 2019 (UTC)
(Dark humo(u)r...) Would a Mass Shooting alert app involve a "trigger warning"? (/Dark whatever). 126.96.36.199 18:21, 25 October 2019 (UTC)
Surface waves cause nearly all of the damage of an earthquake, not s-waves (shear waves). This should be updated. P-waves, or primary waves, arrive first and are compression waves which can also be used to determine the alignment and type of earthquake, such as a normal or reverse fault. S-waves, or secondary waves, follow the p-waves and are shear waves which do cause more damage than p-waves, but they cause far less damage than surface waves, such as Rayleigh and Love waves. Surface waves arrive last, but cause by far the most damage. Randall talks about "p-waves before the obvious main wave", which is likely a reference to p-waves vs. surface waves.