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- W1984548488 abstract "We study seismic activity and focal mechanisms in the vicinity of Indonesian New Guinea (Irian Jaya) in order to clarify the tectonics of this region. Epicentral distribution and vertical profiles of earthquake foci across New Guinea indicate that seismic activity is not associated with the two principal geologic features, the New Guinea Trench and the Medial Mountains, but rather is concentrated in the region between them. We find no seismological evidence of subduction along the New Guinea Trench west of 140°E; moreover, one well-constrained focal mechanism at the New Guinea Trench yields a strike-slip focal mechanism.The region between the New Guinea Trench and the Medial Mountains is characterized by strike-slip faulting and reverse faulting. The focal mechanism of the 1979 Ms =7.6 Yapen Island earthquake off the northwestern coast of New Guinea suggests that active strike-slip motion is occurring along this portion of the Sorong fault system. Thrust-type mechanisms with one nodal plane dipping steeply to the northeast, including that of the 1971 Ms = 8.0 earthquake, are most common in the Meervlakte Basin area between the northern coastal range and the Medial Mountains. Additional strike-slip faulting and thrust faulting are seen in the Tarera and Wandamen Fault Zones in Bird's Neck, and south of the Medial Mountain Suture Zone.We suggest that the oblique convergence between the Caroline and Australian plates in western New Guinea is divided into the strike-slip component represented by the left-lateral shear motion along the major strike-slip fault systems and the dip-slip component represented by the intraplate thrusting such as the reverse faults in the Meervlakte Basin. East of 140°E along the New Guinea Trench, the Bismarck plates are subducting, producing the intermediate-depth seismicity beneath central New Guinea." @default.
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- W1984548488 date "1988-01-01" @default.
- W1984548488 modified "2023-10-05" @default.
- W1984548488 title "Seismotectonics of western New Guinea." @default.
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- W1984548488 doi "https://doi.org/10.4294/jpe1952.36.107" @default.
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