Deretan vulkanik Ungaran - Merapi di Jawa Tengah terletak pada satu kelurusan-vulkanik (volcanic-lineament) yang berorientasi U 67' B. Kerucut - kerucut vulkanik tersebut pada umumnya memproduksi batuan alikali-kapur, namun demikian gunungapi - gunungapi tersebut memperlihatkan sedikit variasi dalam kandungan K20.
Analisa geokimia dan analisa petrografi batuan volkanik gunungapi Galunggung memperlihatkan adanya variasi dari pada senyawa Si02, K20, dan Na20. Seri kekerabatan batuan volkanik adalah arc-tholeiitic suite dengan jenis magmanya andesit basaltic dan basalt. Kedalaman magma antara 137 - 160 km pada zona Benioff dengan temperatur 1250'C - 1350'C.
Erupsi G.Galunggung di wilayah Priangan Timur, Jawa Barat yang berlangsung selama lk. sepuluh bulan sejak 5 April 1982 hingga dengan minggu pertama Januari 1983 terjadi setelah tahun pembentukan kubah lava 1918 (G.Jadi) atau lk. 88 tahun setelah letusan hebat terakhir pada 1894 yang melampaui waktu kritis rata - rata.
The purpose of this report is to indicate the exixtence of a phreato-magnetic volcanic center in the densely populated area south of Cirebon city. On July 6 and July 29, 1988, I examined the geology of the area near the reservoir (waduk) Setu Patok , located 8 km south of Cirebon city (Figure 1) [108 degrees, 47', 10" S; topographic map, 1966 series, sheet 4722 IV, Tjirebon].
Fundamentals of physical Volcanology is a comprehensive overview of the processes that control when and how volcanoes erupt. Understanding these processes involves bringing together ideas from a number of disciplines, including branches of geology, such as petrology and geochemistry; and aspects of physics, such as fluid dynamics and thermodynamics.
The eminent volcanologist T.A. Jaggar in no way exaggerated the significance of volcanic phenomena when je stated that his conception of volcanicity was of a process which is everywhere at work within and beneath the earth’s crust. Today there are more than 500 volcanoes which are still active or at which activity has been recorded during historic times, while the number of extinct volcanoes,…
The eminent volcanologist T.A. Jaggar in no way exaggerated the significance of volcanic phenomena when je stated that his conception of volcanicity was of a process which is everywhere at work within and beneath the earth’s crust. Today there are more than 500 volcanoes which are still active or at which activity has been recorded during historic times, while the number of extinct volcanoes,…
The past 25 years have been vast expansion in the field of igneous petrology to accommodate a wide range of new information from both the Earth and other terrestrial planets. This has made the subject far more interesting, but has also resulted in a marked increase in both the amount and the degree of specialization of the available literature.
PVMBG merupakan salah satu institusi yang khusus bergerak di bidang gunung api, gempa bumi, tsunami, gerakan tanah, erosi dan sedimentasi. Di dunia internasional PVMBG dikenal dengan sebutan Volcanologi Survey of Indonesia (VSI). Di erah digital ini PVMBG mengembangkan multiplatform bernama MAGMA Indonesia. MAGMA Indonesia (Multiplatform Application for Geohazard Mitigation and Assesesment in I…
Gunung api Gamalama merupakan Gunung api strato dengan tinggi puncak 1715 meter dan berada pada zona penujaman celah Sangir-Halmahera. wilayah ini merupakan zona penujaman yang cukup aktif yang dikenal dengan Punggungan Mayu.