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Syllabus

Earthquakes — Syllabus

ICSE · Class 9 · Geography

What Earthquakes covers in ICSE Class 9 Geography: 4 topics, for the 2026-27 session. Part of the ICSE Class 9 Geography syllabus.

53 questions34 flashcards5 concepts

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A cross-section diagram showing the Earth's crust and mantle, clearly indicating the seismic focus (hypocenter) where an earthquake originates, and the epicenter on the Earth's surface directly above
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4 Topics · ICSE Class 9 Geography · 2026-27

Topics in Earthquakes

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1. Meaning and Basic Terms

  • An earthquake is a sudden vibration or movement of part of the Earth’s crust.
  • The seismic focus is the origin point inside the crust or mantle where the rocks suddenly move.
  • The epicentre is the point on the Earth’s surface directly above the focus.
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2. Causes of Earthquakes

  • Earthquakes are caused by volcanic eruptions, folding and faulting, plate tectonics, and anthropogenic factors.
  • Volcanic earthquakes are caused by gas explosions and may occur before or during an eruption.
  • A fault is a fracture in a rock with observable displacement.
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3. Measurement of Earthquakes

  • The magnitude of earthquakes is commonly assessed by the Richter Scale.
  • The Richter Scale was devised by Charles F. Richter in 1935.
  • It was modified in 1965 by Richter and Beno Gutenberg.
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4. Distribution of Earthquakes in the World

  • There are three major earthquake belts in the world and a fourth category called interplate seismicity.
  • The Circum-Pacific Belt is a convergent plate boundary belt and accounts for about 66% of the world’s earthquakes.
  • The Mid-Atlantic Belt is a divergent plate boundary belt caused mainly by seafloor spreading.

Key Concepts

Central concept: Earthquakes

MeaningMeasurementCausesVolcanic EruptionsFolding and FaultingPlate TectonicsAnthropogenic FactorsDistribution of Earthquakes

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Frequently Asked Questions

What are the important topics in Earthquakes for ICSE Class 9 Geography?
Key topics in Earthquakes include Meaning and Basic Terms, Causes of Earthquakes, Measurement of Earthquakes, Distribution of Earthquakes in the World. Study these first, then practise questions on each for Class 9 exams.
How should I revise Earthquakes for Class 9 exams?
Learn the core ideas first, then work through the 53 practice questions on Earthquakes. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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