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Fig. 1 | Earth, Planets and Space

Fig. 1

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. 1

(a) Schematic view of the 3-D simulation model of a plate boundary with frictional parameter γ = a − b. Note that the actual cell size in the simulation is more than eight times smaller than shown here. (b) Frictional parameters (a,γ, dc, κ (see Eq. (2)) as functions of distance along the dip direction from the surface, where (a1, a2) = (2, 5)[×10−3], (γ1,γ2,γ3,γ4) = (0.5, 0.01, −0.3, 4.9)[× 10−3],(dc1, dc2, dc3) = (10, 0.43, 100) [mm], and (κ1, κ2) = (1.0, 0.1). Half the length of the minor axis (along dip) of the elliptical asperity takes the following values: for LA, (R1, R2, R3) = (35, 36.25, 37.5) [km] and for SA, (r1, r2, r3) = (1.33, 1.5, 1.67) [km], where the aspect ratios for LA and SA are 2.0 and 1.5, respectively. The distance between central points of SA along strike and dip direction is 2 and 2.5 km, respectively. The time histories for SA, indicated by the arrow, are shown in Fig. 2.

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