May 13, 2023: Pyroclastic flow caught on camera at Semeru Volcano

A fairly substantial explosion at Semeru Volcano generates a pyroclastic flow that travels nearly all the way down the volcano. Rocks are seen tumbling down ahead of the cloud of super heated gas as it makes its way down the ravine.

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The camera is situated about 8km south southeast of the camera. The view is looking north northwest.

Semeru, the highest volcano on Java, and one of its most active, lies at the southern end of a volcanic massif extending north to the Tengger caldera. The steep-sided volcano, also referred to as Mahameru (Great Mountain), rises above coastal plains to the south. Gunung Semeru was constructed south of the overlapping Ajek-ajek and Jambangan calderas. A line of lake-filled maars was constructed along a N-S trend cutting through the summit, and cinder cones and lava domes occupy the eastern and NE flanks. Summit topography is complicated by the shifting of craters from NW to SE. Frequent 19th and 20th century eruptions were dominated by small-to-moderate explosions from the summit crater, with occasional lava flows and larger explosive eruptions accompanied by pyroclastic flows that have reached the lower flanks of the volcano.

This volcano is located within the Bromo Tengger Semeru-Arjuno, a UNESCO Biosphere Reserve property.

Thumbnail photo: Bromo East Java