Thursday, September 13, 2007


September 12 to 13

First one - Wed. evening - magnitude 8.4
2nd - Thu. morning - magnitude 7.8
3rd - Thu. morning - magnitude 7.1
4th - Thu. afternoon - magnitude 6.2

Indonesia is a "wide" country that runs east to west. It spans three time zones and is, respectively, 12, 13, and 14 hours ahead of Chicago. The Philippines is a "tall" country and spans only one time zone. It is 13 hours ahead of Chicago. I'm writing this on Thu. morning in Chicago so the first earthquake occurred yesterday morning, Chicago time. In other words, these four events occurred in a span of 24 hours, from yesterday morning to this morning.

Richter Scale - Effects - Frequency of Occurrence

6.0 to 6.9 - Destructive within 50-mile radius - 120 per year
7.0 to 7.9 - Serious damage within 100-mile radius - 18 per year
8.0 to 8.9 - Serious damage within 200-mile radius - 1 per year

Click here for a map of these earthquakes.

Click here for the CNN news report of these earthquakes.

Click here for an explanation of the Richter Scale.

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