Here's what earthquake magnitudes mean—and why an 8 can be so much scarier than a 6

Here's what earthquake magnitudes mean—and why an 8 can be so much scarier than a 6  Los Angeles Times Is the US Overdue for a Catastrophic Earthquake? These Cities Are Most at Risk  TIME Rupture within tectonic plate is probable cause of Mexico earthquakes  The GuardianFull coverage

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