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Progress in Earth and Planetary Science
Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

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

Fig. 4

Coulomb stress changes on 70\(^{\circ }\) dipping normal faults for the September 20, 2017 earthquake. Map views at a depth of 11 km and vertical cross sections along the profile indicated by thick solid lines in the map view, which is the same as the profile A–A’ in Fig. 3a, are shown. The stress change on westward- (a, b) and eastward-dipping (c, d) faults with a strike parallel to the mainshock is indicated. The stress changes are calculated for the mainshock fault when it ruptures in both the oceanic crust and uppermost mantle (case 1: a, c) and when it ruptures only in the uppermost mantle (case 2: b, d). Green stars are the hypocenter of the mainshock. The green rectangle on the map view and the thick green line on the cross sections are the assumed faults of the mainshock. The green dashed lines are the contour of a Coulomb stress increase of 0.01 MPa. Open circles are the aftershocks that occurred until September 22, 2017, which are the same as the colored events in Fig. 3. The aftershocks within the dotted rectangle on the map views are projected on the cross sections. The inverted triangles are the OBSs

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