Tanggal 9 s/d 23 November 1983 penulis melakukan penelitian sungai - sungai bagian barat daya Gunung Merapi. Penelitian ini didasarkan adanya luncuran awan panas guguran pada 5 Oktober 1983 serta 6 November 1983.
Kerja praktek di G.Merapi dilaksanakan selama 25 hari dengan melakukan beberapa pekerjaan yang terdiri dari : (1) Pengukuran topografi; (2) Pengamatan visual dari Ngepos maupun Plawangan; (3) Melakukan pembacaan seismogram (rekaman) dan analisa gempa; (4) Pemeriksaan daerah laharan dan aliran sungai serta meninjau daerah yang merupakan contoh usaha penanggulangan terhadap bencana letusan gunung…
Di sekitar G. Merapi dipasang 6 stasiun/lokasi di sekitar 4 buah lokasi, sebelah timur 1 lokasi dan sebelah selatan 1 lokasi, jarak dari puncak minimal 2,5 km dan maksimum 6 km. Sedangkan untuk memonitor G. Kelut dengan metode Dry Tilting telah dipasang sebanyak 7 stasiun yang dipasang di lereng sebelah utara dan barat dengan jarak min 1/2 km dan max 7km dari puncak.
See where the ground in trembling fever quakes And darts galvanic fires; the clouds of smoke Ascend on high, the bolts to heaven fly In all directions; Ashes fall like snow, And scorch the ground; the burning lava boils, Like melted iron flows, and desolation Is spreading far: high hill arise, where none Before had stood, while others fall or sink. The fields of men, their homes, their ca…
The frequency of rockfalls and glowingulouds were continued to be observed through out December 1983. This activity was confined to the south-west of Merapi volcano, to the Batang river and reached a maximn distance of 1.3 km. from the summit.
Dalam bulan November ini telah dilakukan perbaikan terhadap perangkat unit battery yang di G. Malang karena setelah dilakukan pemeriksaan ternyata sel bettery kering ada yang rusak, dan hal ini bisa menyebabkan pedeteksi kemagnetan tidak sempurna.
Peralatan peralatan magnetometer du G. Merapi bekerjanya kurang sempurna data komplit baik untuk Plawangan G. Ijo maupun untuk G. Malang tidak diperoleh.
October - november 1983 rockfalls from the active dome were continued to be obeserved traveling a maximum distance of 1,5 km from the summit.
This Monthly Report marks the end of the first phase of formal cooperative studies between the Volcanological Survey of Indonesia and the U. S. Geological Survey. It therefore seems appropriate to make some summary comments and statements about this two-year, mutually-beneficial program.
August and September 1983 rockfalls from the active dome of lava were continued to be observed traveling a maximum distance of 1.4 k from the summit. Seismic activity during August - September 1983 was similar to that of the previous month. Multi-phase events recorded by the seismo graph at the Babadan field observatory were relatively proportional to those rockfalls events mentioned above.