New Zealand straddles the juncture of the Australian and Pacific tectonic plates. The Australian Plate is on the west side of the boundary, while the Pacific Plate is on the eastern side. The two plates converge in a scissor-like pattern. In the northern part of the boundary, the Australian plate overrides the Pacific plate, and in the southern part of the plate boundary, the Pacific plate overrides the Australian plate. New Zealand sits in the area around the cross point of this tectonic scissor pattern.
The collision of the two plates has built two major islands that together exhibit active volcanoes and fault systems, and these geologic features are very evident in the topographic pattern. This image shows a topographic map of the North and South Islands of New Zealand made from radar data collected by the Space Shuttle Endeavor. Elevation is color-coded, with green at the lower elevations, rising through yellow and tan, to white at the highest elevations. Shading reveals the direction of slopes. Northwest slopes appear bright, and southeast slopes appear dark.
The North Island lies at the southern end of the west-over-east (Australian over Pacific) plate convergence. Here, the Pacific plate dives under the North Island, and the immense heat and pressure created by this subduction process melts the deep rock. The melted rock (magma) rises to the surface through the North Island’s volcanoes and other geothermal features. Most notable are Mount Egmont on the west coast, and Mounts Ruapehu, Ngauruhoe, and Tongariro, clustered just south of the island’s center. The Rotorua geothermal field is northeast of that cluster of volcanoes, and the field appears as a scattering of bumps created by smaller volcanic eruptions.
The South Island straddles the “cross point” of the subduction scissor pattern. To the north of the cross point, the Pacific Plate goes under the Australian Plate; to the south of the cross point, it goes over top. This area around this cross point is not in either subduction zone, which explains why it lacks the volcanic activity of the North Island.
Instead, South Island features a fault system that connects the northern subduction zone to the southern one, which occurs south of South Island. The Alpine fault is the major strand of this fault system along most of the length of the island, near and generally paralleling the west coast. Its impact upon the topography is unmistakable, forming an extremely sharp and straight northwest boundary to New Zealand’s tallest mountains, the Southern Alps. Along the Alpine Fault, the plates are sliding past each other (moving horizontally) somewhere between 35-40 millimeters per year. Vertical differences between the two plates increase at a rate of about 7 millimeters per year, which is consistent with the ongoing uplift of the Southern Alps.
This image is a result of a cooperative project between NASA, NGA and the German and Italian space agencies.
Bank’s Peninsula, South Island, New Zealand (image below)
Bank’s Peninsula, the only recognizable volcanic feature in South Island, is an ancient formation that has been deeply eroded but still possesses the classic circular shape and radial drainage pattern that typify many volcanoes. The peninsula is actually formed by two overlapping volcanic centers—the Lyttelton Volcano northwest and the Akaroa Volcano southeast of the formation. The two large harbors have the same names as the ancient volcanoes. Bank’s Peninsula is joined to the Canterbury Plains to the west by the coalescing alluvial fans formed by the rivers draining the Southern Alps. North and west of the peninsula, sediment deposited by the rivers has been redeposited by the long shore drift to form the New Brighton (north) and Kaitorete (west) spits. Other features are visible in this photograph—Pegasus Bay to the north, Canterbury Bight to the south, the eastern end of Lake Ellesmere to the southwest, and part of the city of Christchurch to the northwest (NASA, Sep. 1994).