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Progress in Earth and Planetary Science
Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

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

Fig. 7

Focal mechanisms in the source area of the October 06, 2017 earthquake. Hypocenters and focal mechanisms are indicated for the earthquakes that occurred during the entire observation period. a Map showing the focal mechanisms estimated from OBS first-motion polarities. Focal mechanisms are color-coded according to the triangle diagram of Frohlich (1992), as indicated in panel (b). Locations of the profile A–A’ to I–I’ are the same as in Fig. 6. Open circles are the earthquakes located from the OBS observations. b Triangle diagram of Frohlich (1992) for the focal mechanisms indicated on the cross sections in panel (c). c Cross sections along the profile A–A’ to I–I’ on panel (a). Focal mechanisms and hypocenters within the dotted rectangles are indicated on each profile

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