Tutuila Volcano | John Seach


Tutuila Island, Samoa

14.295 S, 170.70 W
summit elevation 653 m
Tuff cones

Tutuila is the largest island in american Samoa. The shield volcano, Pago, was formed between about 1.54 and 1.28 million years ago. The large caldera formed approximately 1.27 million years ago.

Tutuila is about 32 km long and ranges from less than 2km to a maximum of 9 km
wide. Tutuila is dominated by the eroded Pago Volcano, which extends laterally over 18km and rises to 653 m at Matafao Peak , west of Pago Pago Harbour.

The smaller satellite volcanoes Olomoana and Taputapu, on the eastern
and western extensions of the main rift zone through Pago Volcano, occurred over the same time interval as the volcanism on Pago.

Further reading
Reinhard, Andrew A., et al. "“Petit Spot” Rejuvenated Volcanism Superimposed on Plume‐Derived Samoan Shield Volcanoes: Evidence From a 645‐m Drill Core From Tutuila Island, American Samoa." Geochemistry, Geophysics, Geosystems 20.3 (2019): 1485-1507.

Tutuila Volcano Eruptions