Recent shallow seismic profilling survey by the Geological Research and Development Centre in cooperation with the Navy (AL) resulted in subsurface bottom sections which give for the first time an insight on the subsurface geology in the vicinity of the Krakatau-group (Akil and Lubis, S., 1983; Sukardjono, 1983).
From late August to early September of 1982, a geophysical cruise was conducted by the Geological Resarch and Development Centre in coperation with Janhidros, Indonesian Navy using the survey vessel KRI-Burujulasad 931. The cruise was intended to determine the sub bottom sediments and the distribution of the volcanic products of the Krakatau eruptions.