Rotomā Caldera
Volcanic caldera in the North Island of New Zealand From Wikipedia, the free encyclopedia
The relatively small Rotomā Caldera (also known as Rotomā Embayment,[1] Rotomā volcanic complex, and spelled Rotoma) is in the Taupō Volcanic Zone in the North Island of New Zealand.
| Rotomā Caldera | |
|---|---|
| Rotoma Caldera, Rotomā Embayment | |
 Lake Rotomā fills the Rotomā Caldera | |
| Highest point | |
| Elevation | 316 m (1,037 ft) |
| Coordinates | 38°05′S 176°35′E |
| Dimensions | |
| Width | 5 km (3.1 mi) |
| Geography | |
.png)  Rotomā Caldera  Rotomā Caldera Rotomā Caldera (North Island) | |
| Country | New Zealand |
| Region | Bay of Plenty |
| Geology | |
| Age of rock | approximately 9,000 years |
| Mountain type | Caldera |
| Volcanic region | Taupō Volcanic Zone |
| Last eruption | 7412 BCE |
| Climbing | |
| Access | State Highway 30 (New Zealand) |
The Rotomā Caldera is located halfway between the city of Rotorua and town of Whakatāne, with its in filling Lake Rotomā being the easternmost in the chain of three volcanic lakes to the northeast of Lake Rotorua. The other two are Lake Rotoiti and Lake Rotoehu.
Geology
The Rotomā Caldera is immediately to the northeast of the area previously called the Haroharo volcanic complex, and now known as the Haroharo vent alignment.[1][2] This is now regarded as part of the much larger Ōkataina Caldera ( Ōkataina Volcanic Centre).[3] It has been usually classified as part of this volcanic structure,[4][5] but given the evidence that it is a region of structural collapse beyond the Ōkataina Caldera rim is perhaps best called an embayment.[1] It is associated with the northern fault boundary zone (Rotoehu Fault, Manawahe Fault, North Rotomā Fault, Braemar Fault, Mangaone Fault) in the Whakatāne Graben part of current rift activity in the Taupō Volcanic Zone. The caldera is likely overlying the former drainage valley that historically Lake Rotorua used before the Rotoiti eruption of the Ōkataina Caldera 47,400 ± 1500 years ago.[6] The Rotomā volcano's most prominent feature Lake Rotomā was formed within the Rotomā caldera when lava flows following a large crater explosion blocked its outlet. The major eruption episodes were about 7412 BCE with about 8 km3 (1.9 cu mi) of material erupted from 3 different magmas from several different vents.[4][5] This eruptive sequence was associated in time with ruptures in the Manawahe Fault about 10 km (6.2 mi) to the north-east.[7] It is known that the changes in vegetation following the eruption, while significant, were short-lived. Pre-eruption forest and mire vegetation recovering to former levels within about 106 years.[8]
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
