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.
The self potential is the one of the family of electrical methods it is the oldest of the geophysical techniques On Indonesian volcanoes the Self method began to carry out since 1978, under the cooperation between the French and the Indonesia team at Merapi volcano.
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.
Volcanic disaster and mitigation concern sany institution and its aspects with five principal elements and play such as) role volcanic crisis 1. Source of the crisis it self(the volcano) 2. Team of the Scientiste who study it 3. The administrative authorities 4. The Media 5. The population who live near by. In Indonesia the five elements of risk are coordinated by the government under sin…
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.