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CSIR-NET 2017 DEC

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116) An earthquake occurring at every 100 years leads to a displacement of 2m over a 40 km long fault. The corresponding shear strain accumulation rate is _____


(Thank to Chandrasekhar, ANU)
 
Solution:


Given that time = 100 years

Displacement = 2 m 
 
Fault length = 40 km = 40,000 m

Shear strain =?


Shear strain =\frac{change in length}{original length}

Change in length (Velocity) =\frac{Displacement}{time}

                   = \frac{2 meters}{100 year}

                                                          = 0.02 meter/ year

Shear stain =\frac{change in length}{original length}

Shear stain =\frac{0.02 meter/year}{40000 meter}

shear strain =0.0000005 / year

shear strain = 0.5 \times 10 ^{-6}/ year



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