Pumiceous tuff deposits of the 1883 Krakatau on the Rakata have been studied in terms of their mineralogical, physico-chemical, and physical properties. Two kinds of pumiceous tuff deposits were identified having similiar vitric type and hypersthene-augite association with few green hornblende and olivine.
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).
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).
Four pedons of Brown Soils originating from material prior to the 1883 Krakatau eruption have been identified in Rakata, exposed or buried under the thick layer of pumiceous anh. Three of those pedons have been studied in terms of their physico-chemiopl proper ties, cand and clay mineralogy. The results indicate that the Brown Soils have been developed from basalto-andesitic volcanic motoria…
Let me begin with a question: why is it that a university, traditionally charged with the academic functions of teaching and reseacrh, finds itself involved in environmental conservation?
The mangrove area is recognized as an area of vital natural resources, if s the interesting and distinctive community being called a "land - builder" (Odum, 1960), which extends the coast and protects the shore from excessive erosion
Untuk pengukuran deformasi ada beberapa macam metoda yang bisa digunakan yaitu diantaranya dengan cara EDM, dry tilt, level-ling dan watertube.
Berdasarkan SPPD No. 1340/P/85 penulis beserta L. Djorahman B.Sc. dan Sdr. M.S.L. Tobing ditugaskan ke Gunung Tangkubanperahu untuk mengadakan pengukuran deformasi dengan cara dry tilt, pelaksanaan pengukuran ini ada kaitannya dengan sedikit meningkatnya kegiatan sismik.
Sisi kelandaian lereng sekitar G. Merapi dimaksudkan untuk memonitor kegiatan G. Merapi dihubungkan dengan perubaham harga kelandaian lereng yang dihasilkan dari pengukuran kelandaiannya.
Pengukuran ungkitan lereng dihubungkan dengan gunungapi aktif pertama dikenal di Hawai oleh Jagger (1926), dimana bandul horisontal dari Se-ismometer yang dipasang di Whitnen Vault dekat puncak G. Keleua menca-tat perubahan waktu lebih lama dari biasanya, sewaktu terjadi ungkitan lereng. Kemudian D.B. Jackson mulai mengembangkan sistim pengukuran ungkitan lereng menggunakan alat penyipat datar …