Riendengan-Sempu (Indonesia)

Status Unknown Eruption Unknown 1549m
Caldera (Subduction zone / Continental crust (> 25 km))

The Riendengan-Sempu complex, just north of the frequently active Soputan volcano, includes the Sempu dome that grew within the 3-km-wide Riendengan caldera. Kawah Masem maar was formed in the W part of the caldera and contains a crater lake. Sulfur has been extracted from fumarolic areas in the maar since 1938. No historical eruptions are known.

The broad 1549-m-high Sempu stratovolcano (background) is seen here from the summit of neighboring Soputan volcano. The prominent cone in the center is Aeseput, a 20th-century cone constructed on the NW flank of Soputan. Gunung Sempu volcano was constructed within a 3-km-wide caldera. Kawah Masem maar was formed in the SW part of the caldera and contains a crater lake and fumarolic areas that have been the site of sulfur extraction. No historical eruptions are known from Sempu.

Photo by Ruska Hadian, 1973 (Volcanological Survey of Indonesia).

Last updated 2019-08-04 00:28:02