Simulation_Tohoku

Tohoku earthquake cycle simulation

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Summary

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Introduction

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Multi-cycle 2D simulations without deep brittle asperities

Figure 1: Simulation of multiple subduction earthquake cycles in 2D. (a) Assumed depth-dependent distribution of rate-and-state friction parameters (a-b) and effective normal stress (σ). (b) Evolution of cumulated slip over several earthquake cycles. Each curve shows the slip as a function of depth at a certain time. The time intervals are irregularly sampled and longer than dynamic rupture time scales. The widely spaced profiles correspond to large megathrust earthquakes. (c) Evolution of slip during a megathrust earthquake. Same representation as in (b), but with shorter time intervals. (d) Moment rate as a function of time over 10 earthquake cycles.

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3D simulations with deep brittle asperities

Figure 2: 3D simulation with deep brittle asperities. Left: spatial distribution of logarithmic slip rate normalized by plate velocity at selected times during and between two M9 megathrust events. Snapshot times are indicated by red circles in the right panel. Right: Peak slip rate as a function of time.

Animation: 3D simulation with deep brittle asperities. Top: Logarithmic slip rate normalized by the plate velocity. Bottom: Peak slip rate as a function of time.