1. Institute of Geological and Nuclear Sciences; PO Box 30-368, Lower Hutt New Zealand
2. School of Geoinformatics, Planning and Building; University of South Australia; Adelaide South Australia 5001 Australia
3. Department of Geological Sciences; Indiana University; Bloomington Indiana 47405 USA
4. Philippine Institute of Volcanology and Seismology; C. P. Garcia Avenue, U.P. Campus, Diliman, Quezon City Philippines
5. National Mapping and Resource Information Agency; Manila Philippines