Abstract
During a 44‐day expedition on board the Australian vessel Rig Seismic, scientists collected new information on the morphology of the Macquarie Ridge Complex (MRC), located at the boundary between the Pacific and Australian plates. In the joint venture, funded by the U.S. National Science Foundation and Australian Geological Survey Organization (AGSO), investigators from the two countries studied deformation in the area along the MRC, which includes the site of the largest earthquake of the 1980s (May 23, 1989, Mω=8.2).The researchers acquired ∼160,000 km2 of HAWAII MR1 (HIG acoustic wide‐angle imaging instrument, mapping researcher 1) side‐scan sonar/bathymetry images and ∼7000 km of 8‐channel seismic reflection data (Figure 1). In addition, three ∼400‐km gravity transects of the MRC were completed across the morphologic ridge and trench system. The transects were augmented by 96‐channel seismic reflection imaging across the morphologic ridge and trench system. Gravity and magnetic data were collected during the entire survey.
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