Fig. 4.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—The parameter τp(t) versus lapse time from P-wave onset for the four events at MYGH12. (Top) with a low-pass filter of 3 Hz. (Bottom) without a low-pass filter.Back to article page