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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Dynamic rupture propagation on geometrically complex fault with along-strike variation of fault maturity: insights from the 2014 Northern Nagano earthquake

Fig. 1

Observed focal mechanisms and principal stress state obtained before the 2014 Northern Nagano earthquake. The map view shows the focal mechanisms picked along the Itoigawa-Shizuoka tectonic line (ISTL) (see the legend for colored indicating the faulting types); the black lines denote the active fault traces, and the Kamishiro fault is highlighted by the red line (after Nakata and Imaizumi 2002). The broken blue line roughly indicates the currently inactive part of the ISTL. The lower panels show the estimated directions of the principal stress axes (stereo net) and the estimated value of stress ratio \(\phi\) (histogram) obtained in the circled area (after Imanishi et al. 2010)

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