earth science

Mount Kusatsu-Shirane

Mount Kusatsu-Shirane is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Mount Kusatsu-Shirane rather than just read about it. In short: Mount Kusatsu-Shirane (草津白根山, Kusatsu Shirane-san) is a 2,165 m (7,103 ft) active stratovolcano in Kusatsu, Gunma, Japan. It is called Kusatsu Shirane to differentiate it from the Mount Nikkō-Shirane on the other side of Gunma Prefecture.

Key takeaways

Mount Kusatsu-Shirane belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mount Kusatsu-Shirane to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mount Kusatsu-Shirane from memory before moving on to harder problems.

Reference excerpt

Mount Kusatsu-Shirane (草津白根山, Kusatsu Shirane-san) is a 2,165 m (7,103 ft) active stratovolcano in Kusatsu, Gunma, Japan. It is called Kusatsu Shirane to differentiate it from the Mount Nikkō-Shirane on the other side of Gunma Prefecture. The summit of Kusatsu-Shirane volcano, located immediately north of Asama volcano, consists of a series of overlapping pyroclastic cones and three crater lakes. The largest of these is Yu-gama, an acidic emerald green lake with rafts of yellow sulfur sometimes seen floating on its surface. On January 23, 2018, a minor phreatic eruption of the volcano occurred. One person was killed, and others were injured in an avalanche triggered by the eruption. The next day, new activity forced police to suspend search operations. One month after the eruption, it was announced by prefectural officials that only the summit of the volcano was off limits to the public.

2025-2026 unrest On August 4, 2025 the Japan Meteorological Agency (JMA) reported that unrest activity had increased. They also raised the Observation alert level from 1 to a 2 "Restriction on the proximity to crater". More then 40 volcanic earthquakes were reported. As of January 8, 2026, volcanic unrest has continued.

See also List of volcanoes in Japan List of mountains in Japan

References

External links

Kusatsu-Shiranesan - Japan Meteorological Agency (in Japanese) "Kusatsu-Shiranesan: National catalogue of the active volcanoes in Japan" (PDF). - Japan Meteorological Agency Kusatsu-Shirane Volcano - Geological Survey of Japan

Illustrations

Worked examples

Example 1 — a first encounter with Mount Kusatsu-Shirane

Start with the simplest possible case. Write down what Mount Kusatsu-Shirane claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Mount Kusatsu-Shirane before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Mount Kusatsu-Shirane ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Mount Kusatsu-Shirane

In research: Mount Kusatsu-Shirane appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Mount Kusatsu-Shirane in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Mount Kusatsu-Shirane is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active volcanoes, Complex volcanoes, Gunma Prefecture geography stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Mount Kusatsu-Shirane outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Mount Kusatsu-Shirane in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mount Kusatsu-Shirane means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Mount Kusatsu-Shirane out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mount Kusatsu-Shirane in simple terms?

Why does Mount Kusatsu-Shirane matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Mount Kusatsu-Shirane?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Mount Kusatsu-Shirane.