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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