Skip to main content
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Characteristics of foreshock activity inferred from the JMA earthquake catalog

Fig. 6

Frequency–magnitude distribution and relationship between the largest foreshock and its mainshock for the long-term data. a Frequency–magnitude distribution and percentage of foreshock occurrence. The white solid and dashed histograms show the frequency of mainshocks versus their magnitude for all families (without singles) and clusters (with singles), respectively; the gray histogram shows the frequency of mainshocks that are accompanied by foreshocks (left axis). The red solid and dashed lines show the proportion of sequences that have foreshocks for all families and clusters, respectively (right axis). b Relationship between the magnitude of the largest foreshock and the corresponding mainshock magnitude for each earthquake cluster. The gray shading indicates M ≤ 1.0 (potentially incomplete data). The lower right inset shows the frequency distribution of the magnitude difference between the mainshock and largest foreshock. The dashed line has a slope of 1.0. The black dots, blue triangles, and red crosses indicate that the magnitude of the largest foreshock is above 1.0, 1.5, and 2.5, respectively

Back to article page