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Report on Merapi (Indonesia) — 19 June-25 June 2019


Merapi

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 19 June-25 June 2019
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2019. Report on Merapi (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 19 June-25 June 2019. Smithsonian Institution and US Geological Survey.

Weekly Report (19 June-25 June 2019)

Merapi

Indonesia

7.54°S, 110.446°E; summit elev. 2910 m

All times are local (unless otherwise noted)


PVMBG reported that during 17-23 June the lava-dome volume at Merapi did not change and was an estimated 458,000 cubic meters, based on analyses of drone images. Extruded lava fell into the upper parts of the SE-flank, generating two block-and-ash flows that traveled 1.2 km down the Gendol drainage on 17 and 20 June. White plumes rose as high as 500 m above the summit. The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to remain outside of the 3-km exclusion zone.

Geological Summary. 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 2,000 years ago, leaving a large arcuate scarp cutting the eroded older Batulawang volcano. Subsequent growth of the steep-sided Young Merapi edifice, its upper part unvegetated due to frequent 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.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)