Report on Banda Api (Indonesia) — 5 April-11 April 2017
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
5 April-11 April 2017
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2017. Report on Banda Api (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 5 April-11 April 2017. Smithsonian Institution and US Geological Survey.
4.523°S, 129.881°E; summit elev. 596 m
All times are local (unless otherwise noted)
PVMBG reported that seismicity at Banda Api had been increasing since the beginning of March, though during 1-4 April seismic patterns were similar to those recorded before an eruption in 1988. The Alert Level was raised to 2 (on a scale of 1-4); visitors and residents were warned not to approach Banda Api within a 1-km radius of the summit area.
Geological Summary. The small island volcano of Banda Api is the NE-most volcano in the Sunda-Banda arc and has a long period of historical observation because of its key location in the Portuguese and Dutch spice trade. The basaltic-to-rhyodacitic volcano is located in the SW corner of a 7-km-wide mostly submerged caldera that comprises the northernmost of a chain of volcanic islands in the Banda Sea. At least two episodes of caldera formation are thought to have occurred, with the arcuate islands of Lonthor and Neira considered to be remnants of the pre-caldera volcanoes. A conical peak rises to about 600 m at the center of the 3-km-wide Banda Api island. Historical eruptions have been recorded since 1586, mostly consisting of Strombolian eruptions from the summit crater, but larger explosive eruptions have occurred and occasional lava flows have reached the coast.