GPS Study of the Transition Between Subduction and Collision in Papua New Guinea

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9725792 Silver This study will investigate how the distribution of strain rates across the Papua New Guinea (PNG) convergent margin evolves from oceanic subduction at the New Britain trench to the broader continental collision. Because the overall rates of motion are high, a geodetic network in PNG can be used to determine the extent to which deformation is distributed rather than focused on discrete faults and the degree to which the primary basal decollement is locked. Working together with scientists from Australia and PNG, the P.I.s will measure an expanded GPS network (48 sites) across the Huon Peninsula and Finisterre Range and across the Markham valley to the New Guinea Highlands, an area of approximately 350 x 350 km. They will occupy the expanded network during June, 1998, and again in June, 2000. Purchasing an additional instrument, an Ashtech Z-12, to leave in PNG between campaigns, will give scientists at UNITECH the opportunity to remeasure baselines between campaigns, an effort of great value for the study of interseismic and intraseismic slip. ***