Shear partitioning near the central Japan triple junction: the 1923 great Kanto earthquake revisited -- II

Details Shear partitioning near the central Japan triple junction: the 1923 great Kanto earthquake revisited -- II Shear partitioning near the central Japan triple junction: the 1923 great Kanto earthquake revisited -- II

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996geoji.126..882p&link_type=abstract

Geophysical Journal International, Volume 126, Issue 3, pp. 882-892.

Mathematics

Logic

7

Earthquakes, Fault Model, Japan, Strike Slip, Subduction

Scientific paper

The faulting mechanism of the 1923 great Kanto earthquake is re-examined. The new fault model is constrained by: (1) the focal mechanism of the main shock; (2) triangulation data; (3) levelling data; (4) the distribution of aftershocks; (5) the geology of the ocean floor east of the Boso peninsula; and (6) the delineation of lateral variations in the dip of the subducting Philippine Sea plate. While factors (1)-(4) have been used to constrain earlier fault models, factor (5) leads us to propose the rupture of a major right-lateral fault (here named the Boso transform fault) which accommodated about 1.6 m of slip in the 1923 earthquake. Kinematic constraints derived from the 1923 main-shock fault geometry suggest that the Boso transform fault accommodates about 1.6 cm yr-1 of the relative plate motion, in agreement with onland and marine geology and the uplift history of the Boso peninsula. All plausible fault models of the 1923 earthquake involve right-lateral slip of the Boso transform fault. Triangulation data are better explained by a model which specifies shallower dip of the subducting Philippine Sea slab southeast of the Miura peninsula, consistent with seismological observations.

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