Dengan surat perintah No. 4174/S/1975, tanggal 4 Oktober 1975, penulis ditugaskan untuk melakukan pengamatan lahar di sungai-sungai sebelah baratdaya Gunung Merapi; sehubungan dengan banjir yang terjadi tanggal 4 Oktober 1975.
Pada tanggal 7 Juni, Poenarmo Kridoharto, Ubed Betakandata dari seksi Esplorasi Geofisika , Pramono dan penulis ditugaskan ke G. Merapi untuk melakukan pengamatan geomagnet.
Antara tanggal 19 hingga 30 November 1961 telah dilakukan pemotretan dari udara diatas daerah sekitar G.Merapi, Djawa Tengah, dengan maksud untuk mengumpulkan keterangan - keterangan jang nantinya dapat dipakai sebagai pegangan pada penafsiran daerah - daerah jang akan bandjir serta akibat2nja.
The wedusgenbels originated because big amounts of gas-rich, but toughliquid magna were ejected, came down along the volcano slope and landed in the very deep ravines, which are situated in the mountain foot on ca. 1400 na.s. Due to their great mobility they have still covered considerable distances in the terrain gullion. It is striking through which sharp turns (portrait 7, 8 and 10), particu…
According daily reports from a mantrie-observer at Haron, during the first half of November 1930 there was many white vapour forning on the top of the Herapi, but nearly everyday he reported, that no stone avalanches were heard.
The breach in the f flank did not originate at once, but in several phases. At the time the though liquid lava looked for a way to the surface, she found the former entrances janned. The canal, through which the lava of the W plug came up and which during aruption erupti phase of 1920 21 still served as way out, was closed now. During the rest period of a few years, the lava han been actually s…
By the paroxismal phenomena on December 18 and 19, 1930 in the W wall of the mountain summit a breach originated with a length of 1350 π. This reached an elevation of 2150 a downwards and near the summit it was about 200 m in width. A big part of the old domes on the summit, including the lavastream of 1922 has disappeared.
Volcanological Office at Jalan Cendana 15-Yogyakarta initially was a Branch office of Volcanology Service.
Kelut volcano is located in East Java. Height above sea level 1731 m. This volcano is known as very dangerous, because its eruption always caused victims and destroyed arable land.
Dalam rangka pengumpulan bahan informasi, sejalan dengan rencana kerja Pelita IV, th.4/1987-1988, melalui rekomendasi dan pengarahan oleh Kepala Sub Direktorat Penyuluhan dan Dokumentasi selaku Staf Pembina Proyek telah dilakukan kegiatan lanjutan pendataan kependudukan berikut pengamatan atas kondisi lingkungan di dalam daerah bahaya gunung api Tangkubanparahu.