Job title: Honorary Research Associate
Phone: +64 9 373 7599 x 87824
Office: Room 301-1005
Postal: School of Environment, The University of Auckland, Private Bag 92019, Auckland
Email: j.cassidy@auckland.ac.nz

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John Cassidy carries out research over a diverse range of geological topics including volcanology, basement tectonics, Quaternary faulting, epithermal mineral deposits and groundwater structure. His speciality is in integrating different geophysical techniques to optimise their effectiveness in the investigation of geological structures and processes. Geophysical techniques employed include aeromagnetic and gravity methods, paleomagnetism, and high-resolution near-surface techniques. A new research theme being developed is the study of recent geomagnetic excursions and their potential use in dating both geological events and archaeological artifacts.

CASSIDY, J. ,FRANCE, S.J. ,LOCKE, C.A. 'Gravity and magnetic investigation of maar volcanoes, Auckland volcanic field, New Zealand.' Journal of Volcanology and Geothermal Research, (in press)

MOCHIZUKI, N. ,TSUNAKAWA, H. ,SHIBUYA, H. ,CASSIDY, J. ,SMITH, I.E.M. 'Palaeointensities of the Auckland geomagnetic excursions by the LTD-DHT Shaw method' Physics of the Earth and Planetary Interiors, 154, 168-179, 2006

SMITH, N. ,CASSIDY, J. ,LOCKE, C.A. ,MAUK, J. L. ,CHRISTIE A.B. 'The role of regional-scale faults in controlling a trap-door caldera, Coromandel Peninsula, New Zealand', Journal of Volcanology and Geothermal Research, 149,312-328, 2006

ECCLES, J. D. ,CASSIDY, J. ,LOCKE, C.A. ,SPORLI, K.B. 'High-resolution aeromagnetic imaging of the Dun Mountain Ophiolite Belt in northern New Zealand: fine structure of a major SW-Pacific terrane suture', Journal of the Geological Society of London, 162, p723-735, 2005

SIMMONS, S.F. ,HARRIS, S.P. ,CASSIDY, J. 'Lake-filled depressions resulting from cold gas discharge in the Ngawha geothermal field, New Zealand', Journal of Volcanology and Geothermal Research, 147, p329-341, 2005

CASSIDY, J. ,LOCKE, C.A. 'Temporally linked volcanic centres in the Auckland Volcanic Field', New Zealand Journal of Geology and Geophysics, 47, p287-290, 2004

MOCHIZUKI, N. ,TSUNAKAWA, H. ,SHIBUYA, H. ,TAGAMI, T. ,OZAWA, A. ,CASSIDY, J. ,SMITH, I.E.M. 'K-Ar ages of the Auckland geomagnetic excursion', Earth Planets Space, 56, p283-288, 2004

LOCKE, C.A. ,RYMER, H. ,CASSIDY, J. 'Magma transfer processes at persistently active volcanoes: insights from gravity observations', Journal of Volcanology and Geothermal Research, 127, p73-86, 2003

WISE, D.J. ,CASSIDY, J. ,LOCKE, C.A. 'Geophysical imaging of the Quaternary Wairoa North Fault, New Zealand: a case study', Journal of Applied Geophysics, 53, p1-16, 2003

AFFLECK, D.K. ,CASSIDY, J. ,LOCKE, C.A. 'Te Pouhawaiki Volcano and pre-volcanic topography in central Auckland: volcanological and hydrogeological implications', New Zealand Journal of Geology and Geophysics, 44, p313-321, 2001

ROLLIN, P.J. ,CASSIDY, J. ,LOCKE, C.A. ,RYMER, H. 'Evolution of the magmatic plumbing system at Mt Etna: new evidence from gravity and magnetic data', Terra Nova, 12, p193-198, 2000

RYMER, H. ,CASSIDY, J. ,LOCKE, C.A. ,BARBOZA, M.V. and 3 others 'Geophysical studies of the recent 15-year eruptive cycle at Poas Volcano, Costa Rica', Journal of Volcanology and Geothermal Research, 97, p425-442, 2000

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