Stphb Yeah News Today

>> well what we do is we detect the very beginnings of the earthquake andee assess how much shaking there is going to be. the amount of warning time is dependent on how far you are from the earthquake. it can vary from a few seconds to a few tens of seconds. jenna: does that warning tell me how big the earthquake might stph-b. >> yeah, as part of the calculation we can give you a warning of the countdown and then how strong the shaking will be. youll have a sense of what is coming and be able to...