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Fig. 2. | Earth, Planets and Space

Fig. 2.

From: Outline of the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0) —Earthquake Early Warning and observed seismic intensity—

Fig. 2.

Region of EEW “warning” and “forecast”, and distribution of seismic intensities estimated in real time manner (Kunugi et al., 2008) at 14:46:48.8 when the “warning” was issued (left), at 14:47:04.0 when intensity 5-lower or greater first appeared (center), and at 14:47:46.0 when the Tokyo region was first specified in the EEW “forecast” (right). Pink area indicates the region where the “warning” was issued, and the yellow areas are those specified in the “forecast”. Wave fronts of P and S waves are shown by broken and solid circles, respectively. The seismic intensities (colored triangles) were measured using waveforms of the K-NET, KiK-net (NIED), and JMA networks. The animation of this figure is shown in the Meteorological Research Institute (2011). The distribution of the eventual seismic intensity, which means finally observed intensity, is shown in Fig. 3.

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