Intraplate earthquakes induced by reactivation of buried ancient rift system along the eastern margin of the Japan Sea - Intraplate Earthquakes - page 246

W35N E35S

Y=+10km

2007

Y=+5km

Y=0km

2004

Y=-5km

Y=-10km

Figure 9.6 Numerical modeling of equivalent total strain in each cross-section shown in Figure 9.2 b
(Shibazaki and Kato, 2012 ) . Viscous, plastic, and elastic strains are included in the total strain. Strain
weakening in plastic deformation is incorporated. White arrows indicate the fault zones corresponding
to the 2007 Chuetsu-Oki (left) and 2004 mid-Niigata Prefecture (right) earthquakes. The upper and
lower dotted lines indicate the boundaries between the upper and lower sedimentary layers and
between the lower sedimentary layer and the basement. White circles indicate the locations of
aftershocks from the 2004 and 2007 earthquakes, as determined by Kato et al . ( 2009 ) .