striking feature of Sunda straits is the volcanic lineament running N3SE direction, from Panaitan island near Ujung Kulon Peninsula ( Java) to Sukadana (SE of Sumatra), and passing through Krakatau archipelago, Sebesi and Sebuku islands, and Mount Rajabasa (Fig. 1). In this group, Krakatau the only volcano which has had historic activity, it is also the only one with strong seismicity
Pada Oktober 1986 penulis berkesempatan untuk melakukan penyelidikan seismik G. Krakatau dengan SPPD No. 1354/0441/3402/86.
Dalam rangka melaksanakan recana kerja Triwulan II, Tim Sumatera dan Jawa Bagian Barat berkesempatan melakukan pengamatan dan penyelidikan seismik di G. Marapi, Sumatera pada Julis 1986 selama 15 hari dengan SPPD No. 589/P/1986.
Dalam rangka melaksanakan Program Pelita IV tahun I, pada 10 Desember 1984 telah diberangkatkan satu regu pemetaan daerah bahaya gunungapi dari Seksi Pemetaan Daerah Bahaya Gunungapi, Sub Direktorat Pemetaan Gunungapi, Direktorat Vulkanologi ke Gunung Rajabasa selama 60 (enam puluh) hari.
After eruption of 1883, studies on the development or the recovery of natural ecosystem on the Krakatau Islands, especially those of vegetation and fauna, have been of great interest to many scientists. However, as far as we know, only a few studies on the soils were carried out (Ernst, 1908; Van Baren, 1931; Newsome, 1982).
The activities of Anak Krakatau are found to be phenomena of eruptive cycles in the hythms of a long-periodic developmental growth. Before the present-day activity of Anak Krakatau which started in December 1927, we know of earlier outburts of Krakatau in 1883, in 1680 and of the 5th century in the year 416 A.D.
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).
Various discussions have been made by many authors as respects the eruption mechanism of Krakatau caldera (e.g. Williams, 1941; Yokoyama, 1981; Self and Rampino, 1982; Yokoyama, 1982). Accumulation of geophysical data may provide important information to clarify the problem. Yokoyama and Hadikusumo (1969) have already established the gravity stations Krakatau Islands. The low residual anomalies…
The gravity survey on Krakatau Islands was first carried out by means of a land gravimeter in 1968 ( Yokoyama and Hadikusumo, 1969) and was supplemented by the present authors in 1982. The gravity points on the islands has reached 40 in number.
As a part of JSPS-LIPI Scientific Program, gravity survey around Sunda Strait was carried out. In Sumatra, the existence of extreme lineality of fault zone called Sumatra fault is postulated. Katili &Hehuwat (1967) adduced some avidences for a horizontal displacement of right lateral character of Sumatra fault.