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Papua New Guinea is one of the most active tectonic regions in the world. It comprises several microplates and deforming zones trapped in the collision of the Australian and Pacific Plates. GPS observations have been used to estimate plate velocities across a network of sites spanning most of the country. We present new velocites in the northwestern region of New Guinea, and look in detail at the strain accumulation region between the South Bismarck and Pacific Plates in the New Ireland/New Britain region. ysed in conjunction with data from up to 70 IGS tracking sites to compute a global, free-network of site positions and velocities. We then align this network with the ITRF97 by computing 6-parameter transformations on the coordinates and velocities of 47 core IGS sites. In this paper we present velocities of sites along the north- ern coastline of New Guinea, around the Ramu-Markham Fault and in the eastern New Britain/New Ireland region and we provide preliminary interpretations of the active tec- tonic forces. We compare observed site velocities to veloc- ities predicted by the Euler vectors for the Australian Plate (31.6◦N, 41.3◦E, 0.62◦/My) (Tregoning et al., 1998), Pacific Plate (61.4◦S, 105.0◦E, 0.63◦/My) (Tregoning et al., 1998) and South Bismarck Plate (6.75◦N, 32.02◦W, 8.11◦/My)

Present-day crustal motion in Papua New Guinea