Report on Merapi (Indonesia) — April 1992
Bulletin of the Global Volcanism Network, vol. 17, no. 4 (April 1992)
Managing Editor: Lindsay McClelland.
Merapi (Indonesia) Continued lava dome growth and rockfalls
Please cite this report as:
Global Volcanism Program, 1992. Report on Merapi (Indonesia). In: McClelland, L. (ed.), Bulletin of the Global Volcanism Network, 17:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199204-263250.
7.54°S, 110.446°E; summit elev. 2910 m
All times are local (unless otherwise noted)
Dome growth continued through early May, reaching an estimated volume of 4 x 106 m3. Combined rockfall and pyroclastic-flow volumes were estimated to be <106 m3. The 1992 dome covered the remnant of the 1957 lava dome that had formed the NW crater rim, causing a shift in the primary direction of glowing rockfalls from W to NW, down the upper Senowo River valley. No pyroclastic flows have been observed since mid-Apr (17:03).
Geologic Background. Merapi, one of Indonesia's most active volcanoes, lies in one of the world's most densely populated areas and dominates the landscape immediately north of the major city of Yogyakarta. It is the youngest and southernmost of a volcanic chain extending NNW to Ungaran volcano. Growth of Old Merapi during the Pleistocene ended with major edifice collapse perhaps about 2000 years ago, leaving a large arcuate scarp cutting the eroded older Batulawang volcano. Subsequently growth of the steep-sided Young Merapi edifice, its upper part unvegetated due to frequent eruptive activity, began SW of the earlier collapse scarp. Pyroclastic flows and lahars accompanying growth and collapse of the steep-sided active summit lava dome have devastated cultivated lands on the western-to-southern flanks and caused many fatalities during historical time.
Information Contacts: S. Bronto, MVO.