Kaba

Geography & Climate

Kaba is located in Indonesia, within the Sunda Volcanic Arc of the broader Sunda-Banda Volcanic Regions. Situated at 3.52° S, 102.63° E in the Southern Hemisphere, the volcano lies within a tropical climate zone. With a summit elevation of 1,962 meters above sea level, Kaba is a moderately sized peak that remains accessible to hikers and researchers for much of the year. The volcanic landform is characterized as a composite, which describes the physical shape and structure of the volcanic edifice as observed from the surface.

Geological Context

Kaba sits in a subduction zone, where one tectonic plate dives beneath another, creating intense heat and pressure that generates magma. Subduction zones are responsible for many of the world's most explosive volcanoes and deadliest eruptions. For communities in Indonesia near Kaba, this tectonic setting means the volcano is capable of producing powerful explosive eruptions, pyroclastic flows, and lahars that can threaten populated areas within tens of kilometers of the summit. The dominant rock type is andesite / basaltic andesite, a dark, fine-grained volcanic rock that forms from rapidly cooling, low-viscosity lava. Basaltic eruptions tend to be less explosive and produce fluid lava flows that can travel long distances. While less immediately dangerous than explosive eruptions, basaltic lava flows can destroy structures and infrastructure in their path, and volcanic gases released during these eruptions can affect air quality over a wide area.

Eruption History Summary

Kaba has 13 recorded eruptions in the geological database, spanning from 1833 CE to 2000 CE. The most powerful recorded event was an explosive event producing ash plumes up to several kilometers in 1956 CE, reaching VEI 2 on the Volcanic Explosivity Index. This level of eruptive frequency indicates a persistently active volcanic system that warrants ongoing monitoring. With eruptive activity as recently as 2000 CE, Kaba remains an actively monitored volcano.

Significance

With 13 recorded eruptions, Kaba has a substantial eruptive history that provides valuable data for understanding volcanic behavior and assessing future hazards in the Sunda-Banda Volcanic Regions region. Given its recent activity, Kaba is closely monitored by geological survey organizations to provide early warning of future unrest.

GVP Reference Summary

The Kaba volcanic massif is ~8 km long, elongated WSW-ENE, with a summit area that includes multiple large craters. On the SW is the 1-km-diameter Hitam crater, with the Malintang cone and 400-m crater ~1 km NE, on the flank of the active 1-km-diameter Kaba crater. The smaller Mali crater is connected to Kaba, and Vogelsang cone is just beyond that to the NE. Another large forested cone is SE of the active craters. Most recorded eruptions have originated from the summit craters, and affected only the summit area. However, the upper-NE flank crater Kawah Vogelsang also produced explosions during the 19th and 20th centuries.

— Smithsonian Institution, Global Volcanism Program