Semeru (Indonesia): Recorded Eruptions and Historical Activity

Semeru, a stratovolcano located in Indonesia at an elevation of 3,657 meters above sea level, has a documented history of volcanic activity spanning over two centuries. According to the Smithsonian Global Volcanism Program's official records, the volcano features a tectonic setting defined by a subduction zone and continental crust exceeding 25 kilometers in thickness. The record contains 64 confirmed eruptions.

The structured historical record distinguishes individual eruptive periods, ranging from smaller reported observations to events reaching a Volcanic Explosivity Index (VEI) of 4.0. The profile's last-known eruption year is recorded as 2026 CE, with specific confirmed eruption entries extending across multiple centuries.

Historical Eruption Timeline and Century Distribution

The 64 confirmed eruptions at Semeru are distributed across three centuries of observation. The earliest recorded eruption in the official database began on November 8, 1818 CE. Historical activity varied significantly by century:

• 19th century CE: 39 confirmed eruptions, beginning with the 1818 CE event and including periods such as the eruption from April 15, 1867 CE, to May 16, 1867 CE, and the event from May 16, 1896 CE, to June 16, 1896 CE.
• 20th century CE: 19 confirmed eruptions, including activity such as the eruption spanning November 16, 1910 CE, to February 16, 1911 CE.
• 21st century CE: 6 confirmed eruptions recorded up through the 2026 CE profile period.

Notable Eruption Characteristics

Recorded eruptive activity at Semeru relies on reported observations. The Volcanic Explosivity Index (VEI) for the documented events reaches a maximum of 4.0. For example, a confirmed eruption originating at the Jonggring Seloko activity area began on February 24, 2019 CE, and concluded on March 25, 2026 CE, registering a VEI of 4.0.