Free printable worksheet · Science
Free earthquake magnitude chart worksheet with answer key
How much rarer is each step up in earthquake magnitude? A one-page worksheet on a chart of trustworthy public data, with three questions and lines to write on, plus an answer key for you. Free, no account needed, and the numbers are the newest the source has published.
The chart on the worksheet
In 2025 the world recorded 6,428 earthquakes of magnitude 4.5 to 4.9, 1,983 of magnitude 5, 129 of magnitude 6, 15 of magnitude 7 and 1 of magnitude 8 or more. Each step up in magnitude is roughly ten times rarer, and releases about 32 times more energy. Countless smaller quakes go unrecorded worldwide, so the chart starts at 4.5.
Source: U.S. Geological Survey, ANSS Comprehensive Earthquake Catalog (ComCat) (Public domain (U.S. government work); source U.S. Geological Survey) · Data as of Dec 31, 2025 · Open the interactive chart and its numbers
What students answer
How to read this chart
Each bar counts the earthquakes recorded worldwide in one year within a range of magnitudes. The bars start at zero. Each whole step up in magnitude releases about 32 times more energy, so a magnitude 7 quake is far more than one step stronger than a 6.
Questions to discuss
- Roughly how many times more common is each band than the one above it?
- The biggest bars are hard to compare with the smallest ones on this scale. What other way could you show these numbers?
- The chart starts at magnitude 4.5. Why might smaller earthquakes around the world go uncounted?
The answer key gives the chart's key numbers (newest, highest, lowest, biggest change) and, for each question, the figures it asks about, written from the same data students see.
Or assign it online
Post this link in Google Classroom, Canvas or Moodle. Students see the interactive chart and the questions; they don't need an account.
A chart for class, every Monday
One fresh chart of public data, three questions to discuss and a link that opens it as a class assignment, in your inbox each Monday. Free, no account. See this week's.