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Fig. 2. | Earth, Planets and Space

Fig. 2.

From: Fault plane of the 1964 Niigata earthquake, Japan, derived from relocation of the mainshock and aftershocks by using the modified joint hypocenter determination and grid search methods

Fig. 2.

Comparison of the aftershock distribution using JMA data with the mainshock focal mechanism estimated by Abe (1975). (a) JMA locations. (b) Hypocenters relocated by using the MJHD method. Strike A–B is perpendicular to the strikes of the two nodal planes estimated by Abe (1975), while strike C–D is parallel to the dip-direction of the best-fit plane. The solid and broken lines in the depth section A–B denote the two nodal planes of the focal mechanism that pass through the hypocenter of the mainshock. The sizes of the crosses denote the error bars of the relocated hypocenters. Solid lines represent the surface traces of active anticline axes as established by Okamura et al. (1994).

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