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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Migration process of very low-frequency events based on a chain-reaction model and its application to the detection of preseismic slip for megathrust earthquakes

Fig. 4

(a) (b) Spatiotemporal evolution of slip velocities at the “Dip” of 115 km along strike (green line in Figs. 4(d) and 4(e)) in the interseismic and preseismic stages, respectively. The broken lines in (a) denote the migration speed in km/day. (c) Close up of the slip velocity evolution in the spatiotemporal region enclosed by the green rectangle in (b), keeping the aspect ratio of space to time. (d) (e) Snapshots of the slip velocity field (d) 20 years after and (e) 0.86 year before the occurrence time of the megathrust earthquake. The ellipse enclosed by the purple curve in (e) represents a large aseismic slip event activating slow earthquakes as shown by the ellipse in (b).

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