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.
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.
The lamongan is not known by big destroying catastrophes such as the Tambora and Krakatau, but as far as the news reach us, he is however one of the most active volcanoes on Jawa.
Volcanological Office at Jalan Cendana 15-Yogyakarta initially was a Branch office of Volcanology Service.
Latihan Satuan Petugas Sosial Penanggulangan Bencana Alam Propinsi Jawa Tengah diselenggarakan oleh Kantor Wilayah Departemen Sosial Propinsi Jawa Tengah, selaku pelaksana Kantor Departemen Sosial Kabupaten Banjarnegara, latihan tersebut diikuti oleh 40 peserta dari empat (4) Ka-bupaten yaitu Kabupaten Banjarnegara, Kabupaten Wonosobo, Kabupaten Batang dan Kabupaten Kendal.
Pemasangan seismograf Kinemetrics PS-2 dengan sistim tele-matri di Pos Pengamatan G. Kelut, dilakukan dengan tujuan meningkatkan sarana peralatan seismograf yang telah ada.
Dalam tahun anggaran 1987/1988, Proyek Pengamatan/Pengawasan Gunungapi dan Penyuluhan Vulkanologi melakukan pemasangan radiotele-seismograph (RTS) di G> Ijen atau lebih dikenal dengan nama Kawah Ijen, Jawa Timur termasuk wilayah Kabupaten Banyuwangi.
Dalam Pelita IV tahun ketiga (1986 - 1987), Tim Pemetaan Daerah Bahaya Gunungapi Proyek Pemetaan Geologi Gunungapi (Seksi Penanggulangan Ba-haya, Sub Direktorat Pemetaan Gunungapi) melakukan pemetaan ulang Daerah Bahaya G. Semeru.