Lesson Plan

• Describe how the Richter, Modified Mercalli, and Moment Magnitude scales quantify earthquake size and intensity.
• Explain the formulas and physical parameters underlying the Richter and Moment Magnitude scales.
• Compare the strengths, limitations, and appropriate applications of each magnitude scale.
• Interpret magnitude values to assess potential impacts considering depth, distance, geology, and building standards.

• Projector and screen
• Whiteboard and markers
• Printed worksheet with scale tables and data sets
• Seismic‑wave animation video
• Fault‑diagram handout
• Calculators
• Online magnitude calculator (access via school computers)

Begin with a brief news clip of a recent major earthquake to capture interest. Ask students what they already know about measuring earthquakes and why such measurements matter. Explain that by the end of the lesson they will be able to describe three key magnitude scales and choose the most appropriate one for different scenarios.

1. Do‑now (5') – Quick quiz on basic earthquake terminology and previous knowledge.
2. Mini‑lecture (10') – Why we measure magnitude; introduction to Richter, MMI, and Moment Magnitude scales with key formulas.
3. Interactive activity (15') – In pairs, calculate Richter and Moment Magnitude values from given data and match observed effects to MMI levels using the worksheet.
4. Comparative analysis (10') – Group discussion using the comparison table; identify each scale’s limitations and best‑fit applications.
5. Check for understanding (5') – Exit ticket: list one advantage and one limitation of each scale.

Summarise the three scales, emphasizing their different purposes and constraints. Collect exit tickets and remind students to complete the quick revision checklist for homework, reinforcing the formulas and intensity descriptions.