Abstract
Halmahera Island is surrounded by the sea to a depth of over 1,000 meters. Morphology of the seabed around Halmahera Island is nearly north-south trending. Physiography is formed by the slighty angle of subduction slope to the east of the Molucca Sea Plate forming the active Halmahera volcanic arc since 11 million years ago. This research was done to analyse the morphostructure and tomography, to identify the submarine hydrothermal activity in the Halmahera Waters, prior to data collection through marine expeditions. The combination of morfostructure and tomography analysis can describe structural geology patterns, subsurface structures are thought to affect the presence of submarine hydrothermal activity. Based on the analysis, it was identified the presence of two pathways of hydrothermal activity and volcanism in Halmahera Waters, surrounding islands are affected by different magma sources.
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