Strain Rate 1
Strain Rate 1 : Strain measurements are computed from observed changes in length on the Earth's surface, commonly along multiple paths. Because the changes in length are observed over varying time periods and path lengths, they are expressed as the change in length divided by the measurement distance divided by the time period of measurement. This number, termed the strain rate, is expressed as the change in length per unit length per unit time. Strain rates vary widely in different tectonic environments, ranging from about 10-8 /year at highly active plate boundaries and 10-11 to 10-12 within stable continental platforms. These differences in strain rates control the average return period of earthquakes
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