Fig. 5.From: Detection of seismic events triggered by P-waves from the 2011 Tohoku-Oki earthquakeP-wave spectral ratios of the Mw 9.0 Tohoku-Oki earthquake compared with the Mw 6.1 reference earthquake over the main Japanese Islands. The spectral ratios are averaged between (a) 2 and 4 Hz, (b) 4 and 8 Hz, and (c) 8 and 16 Hz.Back to article page