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Fig. 10 | Earth, Planets and Space

Fig. 10

From: Dip angles of active faults from the surface to the seismogenic zone inferred from a 2D numerical analysis of visco-elasto-plastic models: a case study for the Osaka Plain

Fig. 10

Results of the numerical simulation for a case with two preexisting fault zones with dip angles of 40° and 30°, corresponding to the Uemachi and Ikoma faults in the Osaka Plain, respectively. a The initial model geometry and time evolution. The hypocenter of the 2018 northern Osaka earthquake (Kato and Ueda 2019), located 12 km beneath the surface position 14 km east from the Uemachi fault, is indicated by a star. The lower panels show a close-up view of a 60 km × 10 km domain including the western and eastern weak zones. The preexisting faults and newly formed faults (markers with a cumulative strain larger than 1) are illustrated in dark blue. OD-1, Um and OD-3 indicate the location of the OD-1, OD-9 and OD-3 core sites, respectively. b Time evolution of the vertical displacement rates along the western and eastern faults. c Time evolution of the sedimentation rates in the Uemachi Upland (i.e., at the location of the OD-9 core site) and at the location of the OD-3 core site. The imposed sedimentation rates at the location of the OD-1 core site are also shown

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