12. Using the Option settings (gear symbol on the upper right), switch to 30 Days, Significant Worldwide and zoom out to the World. Where did the two strongest of these earthquakes occur and what was their magnitude? (3) 13. Switch to 30 Days, Magnitude 4.5+ U. S. What can you say about the pattern of these significant earthquakes across the world? (2)

14. Zoom to California (click on the globe icon beneath the +/- zoom buttons). Switch to 7 Days, Magnitude 2.5+ U. S. Turn on the U. S. Faults layer. What pattern do you notice in the distribution of earthquakes in the western U. S.? (2)

15. Where did the strongest of these earthquakes occur in the western U. S. and what was its magnitude? (2)

16. Go to the USGS "How Much Bigger…?" Calculator (Links to an external site.). Enter the magnitude of the strongest earthquake you found in the previous question. How much stronger (by energy released) was this earthquake than a 2.5 magnitude earthquake