Fault controls on the geometry and location of the Okataina Caldera, Taupo Volcanic Zone, New Zealand
Okataina Caldera is located within the Taupo Rift and formed due to collapse following
eruptions at 325 and 61 ka. Gravity, seismic reflection, topographic and geological data
indicate that active rift faults pass into the caldera and have influenced its location and
geometry. The caldera has a minimum gravity anomaly of− 50 mGal, is elongate north–south
with an inferred minimum depth to caldera floor of 3±0.5 km at the rift axis, and occupies a
10 km hard-linked left step in the rift. The principal rift faults (55–75° dip) define the location …
eruptions at 325 and 61 ka. Gravity, seismic reflection, topographic and geological data
indicate that active rift faults pass into the caldera and have influenced its location and
geometry. The caldera has a minimum gravity anomaly of− 50 mGal, is elongate north–south
with an inferred minimum depth to caldera floor of 3±0.5 km at the rift axis, and occupies a
10 km hard-linked left step in the rift. The principal rift faults (55–75° dip) define the location …
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