Investigating the nature of the Australian/Pacific plate boundary beneath Macquarie Island using teleseismic tomography

Macquarie Island is a small sliver of uplifted oceanic crust and mantle lying between New Zealand and Antarctica, near the middle of the Macquarie Ridge Complex (MRC) - a transpressional plate boundary that divides the Australian and Pacific plates. Evidence for subduction initiation has previously been found at both extremities of the MRC, yet subsurface information on its central portion near Macquarie Island remains limited. In this study, we extract teleseismic waveform data from ocean bottom seismometers (OBSs) deployed around Macquarie Island between October 2020 and November 2021 in conjunction with a small number of temporary land stations and the permanent MCQ station in order to perform teleseismic tomography across the region. We apply a denoising scheme (ATaCR) to help extract as much usable data as possible from the noisy OBS recordings to produce a denoised dataset, which we intend on using to image subcrustal features in order to better understand the nature of this plate boundary.