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Victoria University Antarctic Research Expedition Science and Logistics Reports 2001-02: VUWAE 46

McMurdo Ice Shelf Gravity

McMurdo Ice Shelf Gravity

Figure 8 illustrates the gravity anomalies measured in the survey areas between Ross and White Islands and South and West of Black Island, respectively. Both surveys indicate the presence of "moats" associated with the respective volcanic loads. A deep moat is indicated subparallel to and with its axis 10km East of Hut Point Peninsula. It shallows towards Ross Island and then deviates east over a ridge representing a 30km northwards extension of White Island. A similar, but shallower moat is indicated west and south of Black Island encompassing an oxbow shaped basin between Black Island and Mount Discovery. A shallow sea floor is indicated to the south of Black Island with a 10km northward extension of Minna Bluff beneath the McMurdo Ice Shelf and additional volcanic edifices on the sea floor between Black Island and Minna Bluff.