# Exponential & Logarithm Functions

## 1 Answer

\[M_{SA}=\log\frac{I_{SA}}{S}=\log\frac{4 I_{SF}}{S}=\log 4+\log\frac{I_{SF}}{S}\]

\[=\log 4+8.5=0.602+8.5\approx9.1\]

Thus

\[M_{SA} =9.1 \text{Richter scale}.\]

Poincare

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