Fig. 3.From: Initial 30 seconds of the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0)—amplitude and τ c for magnitude estimation for Earthquake Early Warning—Peak amplitudes Pa, Pv and Pd and the parameter τc versus Mw for the four events studied for various values of tN. Locations of the four stations are shown in Fig. 1.Back to article page