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

Fig. 1

From: The 2018 Hokkaido Eastern Iburi earthquake (MJMA = 6.7) was triggered by a strike-slip faulting in a stepover segment: insights from the aftershock distribution and the focal mechanism solution of the main shock

Fig. 1

a Seismic stations are used in this study. Squares and circles are stations maintained by Hokkaido University and JMA, respectively. Triangles are the Hi-net or F-net stations maintained by NIED. A red star marks the epicenter of the 2018 Hokkaido Eastern Iburi earthquake located by JMA. Thin lines indicate surface traces of active faults (Research Group for Active Faults in Japan 1991). b 1. JMA and 2. USGS are the CMT solutions of the main shock determined by JMA (2018a) and USGS (2018), respectively. 3. JMA and 4. NIED are the focal mechanism solutions of the main shock by using the first-motion polarities of the P wave determined by JMA (2018b) and NIED (2018b), respectively. c P wave velocity structure assumed for calculating the initial hypocenters before the hypocenter determination using a 3-D velocity structure. d Optimal P wave velocity structure obtained from the homogeneous station method

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