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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Precise aftershock distribution of the 2019 Yamagata-oki earthquake using newly developed simple anchored-buoy ocean bottom seismometers and land seismic stations

Fig. 8

Focal mechanisms of the aftershocks determined using data on the polarity of first arrivals recorded by the network of anchored-buoy OBSs and land stations. Lower hemisphere equal area projection was used. A plane view is rotated counterclockwise by 23°. The diameter of the circles for projection of focal solution is proportional to magnitude, and color means the depth of the event. For a determination of focal mechanisms, the position of the events estimated by the location using absolute travel time was used. All the events determined by the network of this study are plotted with a color that indicates the depth of the event. Focal solutions in the vertical profiles are projected onto the vertical plane. Although many events show reverse-fault type mechanism, events with strike–slip fault type and normal-fault type mechanism are also estimated

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