California earthquakes and the Richter Scale

Clicking on this image of the IRIS Seismic Monitor will allow your class to see the most recent image of Earthquake activity.

After a July 4th 6.4 magnitude earthquake, California experienced 7.1 magnitude quake two days later. Many more quakes and aftershocks are expected.

The IRIS (Incorporated Research Institute of Seismology) Seismic Monitor will allow your class to visualize the most recent quakes and their magnitudes in this region.

Use our Richter scale activity to allow your students to get an appreciation of the logarithmic Richter magnitudes.  Discuss linear versus exponential growth and if students are ready, get into logs, either base ten or e.  You might also use our graph of Richter magnitudes at


CCSS: 8.F.4, 8.F.5, HSF.LE.A.1, HSF.LE.A.2, HSF.LE.A.4, HSF.LE.B.5

For members we have an editable Word docx and solutions.

earthquake-richter-scale2019.docx         earthquake-richter-scale2019-solution.pdf



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