Crustal structure in the central South Island, New Zealand, from the Lake Pukaki seismic experiment
| Autor: | Stefan Kleffmann, Anne Melhuish, Fred Davey, David Okaya, Sight Team, Tim Stern |
|---|---|
| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | New Zealand Journal of Geology and Geophysics. 41:39-49 |
| ISSN: | 1175-8791 0028-8306 |
| DOI: | 10.1080/00288306.1998.9514789 |
| Popis: | The crustal structure of the central South Island, New Zealand, has been investigated using explosion seismology measurements. A series of 114 shots were fired in Lake Pukaki and recorded in three modes: on a 120 channel, 6 km long, seismic reflection array rolled along a 27 km profile on the eastern margin of Lake Pukaki; on a Reftek seismograph array consisting of 40 units spread over a 52 km long line, partially coincident with the reflection profile; and wide angle reflections from the lower crust recorded on permanent stations of the New Zealand Seismograph Network that were located between 80 and 120 km from the shots. The data show that the greywacke‐schist forming the mid‐upper crust of the Pacific plate is c. 25 km thick near the east coast and thickens as a crustal root to >35 km beneath the Southern Alps. A strong reflection was recorded from a depth of 25 km and is interpreted to be from the base of the greywacke‐schist crust overlying an old oceanic crust. Below 6 km depth the compre... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|