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Fig. 2. | Earth, Planets and Space

Fig. 2.

From: How precisely can we anticipate seismic intensities? A study of uncertainty of anticipated seismic intensities for the Earthquake Early Warning method in Japan

Fig. 2.

(a) Observed seismic intensities of two nearly identical earthquakes in the Kanto region, Japan (M = 4.8, focal depth 55 and 53 km, respectively). The color of the triangles represents the observed seismic intensities; open triangles indicate stations not used in this analysis. Focal mechanisms obtained from polarity of P waves are also shown. (b) Distribution of the difference in seismic intensity of the two earthquakes determined at the same stations, indicated by color of the symbols. (c) Histogram of the differences in seismic intensity shown in Fig. 2(b), with the average of the differences, RMS value, and number of data points shown at the upper left. A positive value means that the intensity of earthquake 1 is larger than that of earthquake 2; a negative value indicates the opposite.

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