Mount Marapi eruption sends ash 1.6 km (1 mile) above summit in West Sumatra, Indonesia
Mount Marapi in West Sumatra, Indonesia erupted early on March 9, 2026, producing a dense gray ash column rising approximately 1.6 km (1 mile) above the summit. The eruption lasted about 33 seconds and was recorded with a maximum seismic amplitude of 30 mm at the Mount Marapi Volcano Observation Post. Authorities maintain Alert Level II and warn of possible lahars along rivers originating from the volcano.
The eruption of Mount Marapi in West Sumatra on August 12, 2025. Credit: PVMBG
Mount Marapi in West Sumatra, Indonesia, erupted early on March 9, 2026, producing a dense gray ash column rising approximately 1.6 km (1 mile) above the summit. Seismographs at the Mount Marapi Volcano Observation Post (Pos Gunung Api – PGA) recorded the eruption with a maximum amplitude of about 3 cm (1.2 inches) and a duration of approximately 33 seconds.
Observers at the monitoring post reported that the ash column was gray with thick intensity and drifting eastward from the crater. Bilal Allegra Munbaits, an officer at the Mount Marapi Volcano Observation Post, said the plume moved eastward from the summit area.
The volcano remains at Alert Level II (Waspada) under the monitoring system of Indonesia’s Center for Volcanology and Geological Hazard Mitigation (PVMBG). Authorities prohibit residents and visitors from entering within a 3 km (1.9 miles) radius of the crater due to the risk of sudden eruptions and volcanic hazards.
PVMBG warned of the potential for lahars, also referred to as cold lava flows, particularly along rivers that originate from the volcano’s slopes. These flows can occur during rainfall when loose volcanic material deposited on the slopes is mobilized into river channels.
Authorities advise residents to wear masks covering the nose and mouth if ashfall occurs in nearby communities to reduce respiratory irritation caused by volcanic ash.
Mount Marapi rises 2 891 m (9 485 feet) above sea level on the island of Sumatra and lies between Agam and Tanah Datar regencies in West Sumatra Province. The volcano frequently produces explosive eruptions that generate ash emissions.
Indonesia contains about 130 active volcanoes and sits along the Pacific Ring of Fire, where the Indo-Australian Plate subducts beneath the Eurasian Plate, producing intense volcanic and seismic activity across the region.
References:
1 Indonesia’s Mount Marapi erupts, spewing ash up to 1 mile – Anadolu Agency – March 9, 2025
I’m a science journalist and researcher at The Watchers, contributing to the Epicenter edition, where I cover peer-reviewed scientific research and emerging discoveries across Earth and space sciences. With a background in astronomy and a passion for environmental science, I’ve worked in shark and coral conservation in Fiji, conducting reef and shark-behavior research, contributing to mangrove restoration, and earning PADI Open Water and Coral Reef Certifications. I bring a blend of scientific rigor and storytelling to illuminate the discoveries shaping our planet and beyond.
