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The problem with the Richter Scale is that because it is logarithmic, it's hard to really grasp the immense power of the higher numbered earthquakes.  It's a handy number for news people to toss around, but Joule equivalent or TNT energy yield equivalent lets you better understand just how much energy is involved.

The earthquake in Haiti was 7.0 and the quake in Chile was 8.8.  Doesn't really sound like much of a difference, does it?  But if you look at the amount of energy released, the Chilean quake becomes absolutely staggering.  The quake in Haiti released the energy equivalent of about 32 megatons, less than the 50 megatons of the Tzar Bomba.  The quake in Chile on the other hand was about 15,800 megatons, about 6-1/2 times greater than the total current US nuclear weapons arsenal (about 2,330 megatons) and almost 500 times bigger than the Haitian quake.

There are a number of reasons why the Haiti quake was so much more ruinous: proximity to population centers, focal depth, terrain, etc, but the overwhelming poverty in Haiti was probably the biggest factor.  Haiti is the poorest country in the Americas with a GDP per capita of only $790, while Chile is a G-20 member with a GDP per capita of $10,100.



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Feb. 28th, 2010 07:03 pm (UTC)
Fascinating, thanks! You're right about the news tossing the numbers around- all too confusing.

MSNBC seemed disappointed when their all-day tsunami coverage showed little more than a slight rise in the beachfront water levels, when their looping cgi showed a wall crashing over the hotels.
Feb. 28th, 2010 08:39 pm (UTC)
There's also the fact that Chili gets quakes on a regular basis. They've had 13 magnitude 7 or greater quakes since 1973. They build to handle them. Even so an 8.8 quake is huge.
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