Skip to main content
Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Driving stress and seismotectonic implications of the 2013 Mw5.8 Awaji Island earthquake, southwestern Japan, based on earthquake focal mechanisms before and after the mainshock

Fig. 8

Results of stress tensor inversion. a Earthquake distribution of each dataset used in stress tensor inversion. The number within each dataset of parentheses indicates the number of events used for the inversion. b Results of stress tensor inversion for each dataset. The left-hand panels show the principal stress axes with their 95% confidence regions plotted on the lower hemisphere stereonets. The middle panels show the misfit angle for the data with respect to the optimal stress tensor determined by the stress tensor inversion. Here, the misfit angle represents the angle between the tangential traction predicted by the optimal solution and the observed slip direction on each plane, as determined from the focal mechanism. The right-hand panels show the frequency of the stress ratio ϕ, which belongs to the 95% confidence region. c Frequency of the azimuth of \({\sigma }_{1}\) from the 95% confidence region of the stress tensor inversion. Here, 180° is subtracted from azimuth, if necessary, to ensure that all orientations can be plotted in the range of 0° to 180°

Back to article page