New Archaeointensity Data from the SW Pacific: towards better constrained global geomagnetic field models

Friday, 19 December 2014: 9:15 AM
Mimi J Hill1, Andreas Nilsson1, Richard T Holme2, Megan L Thomas1, Elliot Hurst1, Gillian M Turner3 and Peter Sheppard4, (1)University of Liverpool, Liverpool, United Kingdom, (2)University of Liverpool, Liverpool, L69, United Kingdom, (3)Victoria University of Wellington, Wellington, New Zealand, (4)University of Auckland, Auckland, New Zealand
Southern hemisphere archaeomagnetic data are sparse, archaeointensity data especially so. In order to better understand field behaviour in the region and for better constrained global geomagnetic models more data are needed. We present new archaeointensity data from a collection of ceramics from the SW Pacific Islands including Fiji, Tonga, Papua New Guinea, New Caledonia and Vanuatu covering the last 3000 years. The microwave method has predominantly been used with a variety of experimental protocols including IZZI and Coe variants. Standard Thellier archaeointensity experiments using the IZZI protocol have also been carried out on selected samples. The data are presented and compared to the global geomagnetic field model pfm9k.1 and other data sets from around the globe. Particular focus will be on the extent and mobility of strong intensity peaks such as seen at around 1000BC.