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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Causes of the N–S compressional aftershocks of the E–W compressional 2008 Iwate–Miyagi Nairiku earthquake (M7.2) in the northeastern Japan arc

Fig. 2

Conceptual diagram of the method proposed by Lin and Shearer (2007). a P vs. S differential travel times for a single pair of events. b Synthetic P vs. S differential arrival times for several pairs of events in a compact cluster. c Distribution of differential arrival times after shifting the data shown in (b) so that they are aligned along a line crossing the origin, using the average values of respective event pairs for alignment. The slope of the line represents the local Vp/Vs ratio for the cluster. d Example of real data distribution after Lin and Shearer (2007). Outliers are indicated by red arrows and text

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