EPS C20 Lecture Notes - Lecture 21: Network Delay, Amgen, Google.Org
17 Nov 2020
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Early shaking doesn"t start until s-wave arrives. Ex: mexico city - m7. 1 - september 19, 2017. Warning system didn"t sound siren until p-wave actually arrived. And now we have it: california"s earthquake early warning. October 17, 2019 - 30th anniversary of loma prieta. San francisco - 1868 (last time we had a big eq on hayward fault) Developed in 1989 in the wake of the 1985 michoacan earthquake. Station data transmitted to central processing in mexico city. Warning issued when two stations indicate an event greater than. Event successfully detected & an alert issued. Jan 1995 : kobe earthquake -- 6,000 dead. Oct 2017 : nationwide public warning system launched. M9. 1 -- tohoku-oki earthquake -- march 11, 2011. Components of an earthquake early warning system. For any user location: time till shaking & shaking intensity can be estimated. Using amplitude [pd] & frequency content [tau-p-max]
