The summit of G. Merapi is formed by a lava-plug; a cratershaped decline, such as the most volcanoes possess, is not present. However it is known,-thanks to the many interest, with which the G. Herapi in the pant century obtained, that the volcano in another stage of eruptive activity certainly owed such a cratershaped decline.
At the end of February 1920 by the Sectionhead of the Irrigation at Lumajang was reported, that in that month an abnormal drop of the waterlevel of the Ranu's Klakah and Pakis had taken place. If the Ranu Klakah in normal times always flowed through his nator al outlet, at present it is not like this, as the lake level has drop till 1.5 m below the outlet This even happens during the full W …
On October 12, 1920 the inhabitants of the most high laying kampungs in the vicinity of the Blongkengravine were surprised by hot dustclouds and were killed by the burns. It appeared inmediately, that there was no outburst at all, as the summit slopes of the Merapi were, as far as they were overgrown in August and September, were still green as before (the reports from news papers concerning th…
The spreading of the Herapi products is of a great agrogeologic Importance, as the Merapi products compared with the rocks of other Java volcanoes are extraordinary fosforrich. Only towards one side these products could develop feely, namely in the plane of Solo, whare they border to that of the Lavu. To the S the spreading was stopped by the southern mountains, only in the area of the kali Opa…
G. Lokon yang terdiri dari Puncak Lokon dan G. Empung merupakan gunung api aktif yang letusannya telah dikenal sebagai eksplosif. Frekuensi letusannya menunjukan peningkatan terhadap selang waktu terjadinya letusan. Hal ini dapat dilihat dari sejarahnya dimana sebelum th.1800 mempunyai selang waktu letusan yang sangat lama (400th), meningkat 2 kali terjadi letusan dalam kurun watu 100 tahun kem…
As already earlier mentioned the G. Herapi exists of two morphologic clearly to be distinguished parts, an older eastern and a younger western part. From the sunnit of the old ringdike, only a small part remains (see portrait 14), of which the eastern part is named G. Pusunglondon (2694.3 a.s.) and the northern G. Paseban (2679= a.s.). The old volcano mantle of the G. Merapi has grown much more…
G. Lokon secara administratif berada dalam wilayah kecamatan Tomohon, Kabupaten Minahasa, Provinsi Sulawesi Utara. Secara Geografi berada pada 1° 21,5' Lintang Utara dan 124° 47,5 Bujur Timur. Dalam klasifikasi gunung api aktif di Indonesia umumnya disebut G. Lokon - Empung. Memang terdapat dua bentuk gunung yang menonjol pada jarak lk. 2,2 km satu dari lainnya. Karena memiliki bentuk yang me…
Still a single word on the built up of the volcano as appears from the exposures out side the crater. In all ravines visited by the author, this are the lahar Badak, the lahar Siwalan, the Kali Ijir and the lahar ligobo, the number of lava out flows was not to be called a few. On portrait 17 we see more of such andesite break-through exposed in the ravine of the lahar Ngobo. Remarkable is the f…
As far as we can conclude from the volcanical history of the G.Kelut, after each out burst a craterlake was formed (Portrait of the Craterlake anong others in 'Geweldige Natuurkrachten' by Vissering in J.v.h. Mijnwezen 1907, Verhandeling Hugo Cool and a.m.). As most of the strate volcanoes has no craterlake there must be extraordinary conditions present, when at such volcano body craterlakes…
Dari Pos Pengamatan Gunung api G. Lokon dan G. Mahawu atau dari Tomohon, secara fisik G. Mahawu nampak seperti perahu yang tertelungkup, mirip dengan G. Tangkuban parahu di Jawa Barat, memanjang dari utara ke selatan. Terletak berdampingan dengan G. Lokon, sehingga populer dengan sebutan Lokon - Mahawu. Lembah yang terbentuk antara keduanya merupakan jalan raya Tomohon yang menghubungkan antara…