Paterno R. Castillo1,2,3, P. E. Janney3,2,1, Renato U. Solidum4
1Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0220, USA
2Fax: (619) 534-0784
3Tel.: (619) 534-0383
4Philippine Institute of Volcanology and Seismology, Quezon City, Philippines