The Mexico City Earthquake Is a Warning for Americans
It's not a matter of whether a major quake will occur in the U.S., but when/ : at least 230 dead, including at least 21 schoolchildren; nearly 50 buildings flattened; entire communities without power or cell phone coverage. It’s a grim reminder of just how devastating a seismic event can be. But what is particularly chilling is that this quake could have been much worse. Monday’s earthquake was an M 7.1. That M stands for “magnitude,” or the amount of energy released in a quake. Magnitude is measured exponentially: in other words, the 1906 ...
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