earthquake 100 km from the source I = 1 x 10^6 W/m^2. What is the difference of

Question

earthquake 100 km from the source
I = 1 x 10^6 W/m^2.
What is the difference of the magnitudes at 400 km vs 100 km? earthquake 100 km from the source
I = 1 x 10^6 W/m^2.
What is the difference of the magnitudes at 400 km vs 100 km? earthquake 100 km from the source
I = 1 x 10^6 W/m^2.
What is the difference of the magnitudes at 400 km vs 100 km? earthquake 100 km from the source
I = 1 x 10^6 W/m^2.
What is the difference of the magnitudes at 400 km vs 100 km?
I = 1 x 10^6 W/m^2.
What is the difference of the magnitudes at 400 km vs 100 km?
What is the difference of the magnitudes at 400 km vs 100 km?

Explanation / Answer

Intensity = power / area

so intensity = P/4*pi*r^2

if distance is multiply by 4 then

Intensity decrease by sqrt(4)

new intensity = 1*10^6 / sqrt(4) = 0.5*10^6 W/m^2

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