Letusan yang tiba -tiba terjadi di deretan pegunungan sebelah selatan Kota Ruteng, yang dikenal dengan nama G.Mandosawu, amat mengejutkan kalangan ilmuwan kegunungapian. Betapa tidak, deretan pegunungan di Flores itu, telah lama diketahui sebagai deretan gunungapi yang mati. Tidak ada suatu gejala gunungapi pun nampak di igir pegunungan yang merentang dari barat ke timur itu. Setidaknya, selama…
Mount Tambora is one of the volcanoes that contribute to the environment of our globe. The impact of the 1815 gigantic eruption shared the role in the development of the history of the World. The volcanic dusts changed the summer in Europe into the wet rainy and cold weather. The unfavourable condition forced the warring nations to enter peace. The Napoleomic war was terminated.
Nama Van Bemmelen mungkin paling banyak dirujuk dalam penyelidikan geologi di Indonesia. Bukunya yang monumental The Geology of Indonesia merupakan sumber informasi yang tak putus - putusnya sampai ke abad milenium ini. Hal itu terjadi karena buku tersebut merupakan rangkuman hasil penyelidikan Belanda selama satu abad sejak pertengahan abad ke-19. Dalam era eskalasi industri yang semakin memun…
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.
Krakatau Volcanic Complex located in Sunda Strait, Indonesia, erupted catastrophically in 1883. The eruption was preceeded by the increasing number of seismicity during the last 7 years prior to the eruption. The initial stage of the eruption was indicated by the ash outburst of Perbu- atan volcano in May and followed by another activity in the area south of Danan Volcano in July, 1883. Ashes i…
Pumice flow of the 1883 Krakatau eruption occurs It at Small Rakata, Rakata and Sertung Islands, those which roughly correspond to the wall of Krakatau caldera, Indonesia. significantly differs in both mineral and chemical compositions against any other volcanic rock or ejecta of the Krakatau Group, those of which belong to Miyashiro's (1974) tholeiitic series. Meanwhile, lithic fragments of gr…
This report outlines the preliminary account of Mt. Galunggung eruption that took place beginning of April 1982 and continued for several months. After almost 64 years of quiesence Mt Galunggung, located some 350 km souhteast of Jakarta, suddenly erupted at dawn of April 5, 1982. The explosion, heralded by bright glows and lightnings, awakened some 200,000 people living close to the volca-no. A…
The eruptions produce lava, fragments (Bombs, Blocks, Lapilli & Anh). This view shows, upper left, the eruptive centre (G.Jadi) from 4km distance. The smoking ashey deposit in the centre has been deposited from a high density burning gas cloud (Nude Ardente) of 25/4/82. The foreground shows a loosely consolidated mud and boulder deposit (lahar).
The topographic reconnaissance survey was carried out by us in March 15, 1983. The survey has utilized the modest available equipment for surveying, e.i. magnetic geologic compass and range finder. Altimeter was also used to determine the elevation. The survey was done in the morning between 7.00 to 8.00 am.
Pada tanggal 7 Desember 1980 telah diadakan peninjauan kegiatan pengamatan G. Merapi oleh Bapak Sekretaris Jenderal Pertambangan dan Energi. Mendampingi beliau adalah Bapak Kepala Biro Hubungan Luar Negeri, Djayadi Hadikusumo, se-laku bekas pimpinan Sub Direktorat Vulkanologi, dan sebagai ahli gunungapi. Peninjauan kerja ini lebih bersifat in-cognito