6-639: The Maroa Caldera (Maroa Volcanic Centre) is approximately 16 km × 25 km (9.9 mi × 15.5 mi) in size and is located in the north-east corner of the earlier Whakamaru caldera in the Taupō Volcanic Zone in the North Island of New Zealand. Its northern rim is to the south of the Waikato River at Ātiamuri . At Ātiamuri the Ohakuri Caldera which had a paired eruption with
12-421: Is now mainly dome lava in filled. In summary going back in time: Whakamaru caldera Whakamaru Caldera was created in a massive supereruption 335,000 years ago and is approximately 30 by 40 km (19 by 25 mi) in size and is located in the North Island of New Zealand . It now contains active geothermal areas as well as the later Maroa Caldera . The Whakamaru Caldera covers an area larger than
18-662: The Rotorua Caldera is to its immediate north. The eastern boundary is also defined by the present Waikato River and it extends as far south as probably opposite Orakei Korako on the river. The southern boundary is somewhat ill defined given the subsequent deep deposits from the Taupō Volcano but includes a number of domes of which the highest is Maroanui at 897 metres (2,943 ft). The Maroa Caldera's last major eruption produced 140 km (33.6 cu mi) of tephra about 230,000 years ago (230 ka ). Its earliest eruption
24-536: The caldera include the Western Dome Complex, including Pokuru which defines its north western borders (which likely overlap with those of the older Mangakino caldera complex ), Forest Road Dome, Puketarata (near Te Pouwhakatutu, which is the last Maroa Caldera eruption, now known to be 11,300 ± 1,700 years ago), Ngangiho, which is 629 metres (2,064 ft) high but beaten by Ben Lomond 744 metres (2,441 ft), and Marotiri 733 metres (2,405 ft) just to
30-650: The younger Taupō Volcano to its south and indeed the rims overlap. To its north the more recent eruptive centres have sometimes been grouped as the Mokai Ring Complex or Maroa Volcanic Centre . It contains to its north east the more recently active Maroa Caldera with the Ben Lomond Dome being outside the southern border of the Maroa Caldera but definitely a feature of the Whakamaru Caldera. Domes within
36-452: Was about 300 ka with decreasing frequency and volume to as recently as 11.3 ± 1.7 ka, when an eruption of about 0.25 km (0.1 cu mi) occurred from the Puketarata volcanic complex ( 38°33′02″S 176°03′16″E / 38.550573°S 176.054519°E / -38.550573; 176.054519 to distinguish from another older volcano of this name near Te Kawa ). The caldera
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