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Progress in Earth and Planetary Science
Fig. 5 | Progress in Earth and Planetary Science

Fig. 5

From: Fault geometry of M6-class normal-faulting earthquakes in the outer trench slope of Japan Trench from ocean bottom seismograph observations

Fig. 5

Mainshock and aftershock activity of the October 06, 2017 earthquake. a Map showing the epicenter distribution of the October 06, 2017 earthquake and its aftershocks. The mainshock and aftershocks within the dashed rectangle are circles color-coded with time after the mainshock, as indicated in panel (b). The mainshock is marked with a green star. The focal mechanism of the mainshock from the GCMT catalog and OBS first-motion polarities are indicated. b Magnitude-time diagram of the earthquakes within the dashed rectangle on panel (a). c, d Cross sections of the hypocenters along the profile A–A’ on panel (a). Focal mechanisms from the OBS first-motion polarities are also indicated on panel (d). The focal mechanisms are color-coded by the faulting types according to the triangle diagram of Frohlich (1992), as shown in Fig. 2. The gray rectangle indicates the area of the earthquakes that occurred within 1 h from the mainshock. e Cross sections of the hypocenters along the profile B–B’ on panel (a)

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