The effect of crustal fluid for the spontaneous dynamic fault rupture simulation

抄録

The effect of crustal fluid was investigated for the spontaneous dynamic fault rupture simulation without giving a priori rupture starting area and rupture stopping area. We considered the crustal fluid that had higher pressure than the groundwater pressure on the fault plane. Under the condition, our dynamic fault rupture simulation was able to reproduce that the spontaneous initial rupture occurred, and after the rupture propagated along the fault plane, and then the spontaneous rupture stopped. It was shown that the rupture propagation velocity, slip displacement, slip velocity, etc. were consistent with the results obtained from the inversion analysis of actual inland crustal earthquakes. Using the dynamic fault rupture simulation, the authors showed that the crustal fluid had a significant effect on the fault rupture.