1. Geoscience Australia, GPO Box 378 Canberra, Cnr Jerrabomberra Avenue and Hindmarsh Drive, Symonston, Australian Capital Territory 2601, Australia, jonathan.griffin@ga.gov.au
2. Also at Department of Geology, University of Otago, Dunedin 9016, New Zealand.
3. Research School of Earth Sciences, The Australian National University, Building 142 Mills Road, Acton, Australian Capital Territory 2601, Australia, ngoc.nguyen1@uqconnect.edu.auphil.cummins@anu.edu.au
4. Centre for Volcanology and Geological Hazard Mitigation, Geology Agency of Indonesia, Jalan Diponegoro No. 57, Bandung, West Java 40122, Indonesia
5. Also at Research School of Earth Sciences, The Australian National University, Acton, Australian Capital Territory 2601, Australia.