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.
The author (1981) put an interpretation of the 1883 Krakatau eruption from the standpoint of geophysics. In the present paper, mainly the generation of the tsunami in the eruption will be discussed to supplement the previous interpretation.
The mount Anak Krakatau is one of the volcano island of Krakatau group or Krakatau volcano island complex consisting four islands of Anak Krakatau, Rakata, Small Rakata and Sertung, those of which are located in Sunda Strait between Sumatra and Java.
The significant change in seismic activity for an active volcano is closely related to the stage of volcanic activity. Even in the dormancy period, the observation of seicmic activity of a particular volcano is very important to evaluate the status and to anticipate the future behavior. The Volcanological Survey of Indonesia installed triparti- te instruments at the Anak Krakatau and Sertung…
Our earth as a fascinating space ship proves to be ever more so the more we learn about it. We evoloved here, it is our planet and our home, but alas, we only have a very limited direct experience of its past history.
Gunung Dempo terletak di daerah Kecamatan Pagar Alam, Kabupaten Lahat, Propinsi Sumatra Selatan. Pada posisi geografi 4°02' Lintang Selatan, 103° 08′ Bujur Timur. Gunung Dempo adalah gunung tertinggi di Propinsi Sumatra Selatan (3173 meter dari permukaan laut) yang merupakan gunungapi strato tipe A (klasifikasi Direktorat Vulkano- logi Bandung, 1979) dalam jajaran busur vulkanik Bukit Barisan.
Berdasarkan Surat Perintah Dinas No. 2506/P/1984, dari Pe- mimpin Proyek Penyelidikan dan Pengamatan Gunungapi, kami ditugaskan untuk melakukan pengamatan dan penelitian seis- mik ke G.Marapi dan G.Talang di Sumatra Barat. Tujuan pengamatan ini adalah untuk mengumoulkan data gempa serta hasil analisanya yang mungkin dapat dipakai untuk menentukan tingkat kegiatan gunungapi tersebut selama masa …