Mount Semeru, Indonesia — 55 eruptions since 1800 mapped as concentric rings using Smithsonian GVP eruption data [OC] Statistics

What This Visualization Shows

This data visualization displays "Mount Semeru, Indonesia — 55 eruptions since 1800 mapped as concentric rings using Smithsonian GVP eruption data [OC]" and provides a clear visual representation of the underlying data patterns and trends. The visualization focuses on This is a concentric shape plot of Mount Semeru — Java’s highest peak and one of Indonesia’s most consistently active volcanoes, currently on Alert Level IV (Warning).

How to read it:

Each ring represents a recorded eruption from the Smithsonian Global Volcanism Program database. The spacing between rings is driven by the VEI score of each event — a more powerful eruption pushes adjacent rings further apart, a lower intensity event produces tighter, closer lines. Where rings bunch together, the volcano was erupting frequently at lower intensity. Where they spread, a more powerful event occurred.

The petal shape comes from directional data. Semeru doesn’t erupt equally in all directions — its dominant eruptive corridor runs southeast along Besuk Kobokan, the primary channel for pyroclastic flows and lahar. The algorithm maps eruption directionality onto the angular spread of each ring. Petals form where eruption energy was repeatedly channelled in the same compass direction across multiple events and across centuries. The widest petals are the most persistently active eruptive corridors. The centre point is the summit — everything radiates outward from there, exactly as it does on the mountain.

The numbers: — Alert status: Warning (current) — Eruptions since 1800: 55 — VEI range: 2–4 — Type: Stratovolcano — Tectonic setting: Subduction zone — Last eruption: 2024 — Notable: 2021 eruption produced pyroclastic flows 13km long, nearly 50 fatalities, which allows us to understand complex relationships and insights within the data through visual storytelling.

Deep Dive into the Topic

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