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      Graph Style:      
 Quake Strength 
All Quakes
Magnitude 1+
Magnitude 2+
Magnitude 3+
Magnitude 4+
Magnitude 5+
Magnitude 6+
Magnitude 7+
Magnitude 8+
    Data to Graph    
Number of Quakes
Total Strength
Total Magnitude
Avg. Strength
Avg. Magnitude
    Graph by    
the average strength of earthquakes that ocurred in each year.

Only earthquakes that are greater than or equal to magnitude 1.0 are
higher magnitudes helps to correct for this possibility.

a 'smoothed' graph.
This means that we have tried to place the points on the graph
into a smooth curve. This shows us the overall trend of earthquakes over time. If
earthquakes have increased for several years in a row, the line will start to curve
upwards. If earthquakes have decreased for several years in a row, the line will start
to curve downwards.



of each of the available options.

