From the air, looking north to Ofu Island (left) and Olosega Island (right), Samoa. Once a single island like Ta?u, landslides and flank failures have sculpted this older volcano into two islands. An ankaramite dike collected on the north side of the small peak just west of the waterway between Ofu and Olosega gives the highest 3He/4He isotope value in Samoa. (Photo by Bob Greschke)



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Last updated October 8, 2014
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