A busy week of earthquakes has stoked concern worldwide. This special report explains what causes quakes, why nearly 100 tremors were recorded in seven days, and why most events are not linked. We examine the most recent Gulf of California quake, rising stress on the San Andreas, the double earthquakes in Venezuela and how scientists use seismic networks, GPS and models to assess risk.  
Scientists explain how these series of quakes aren't linked to each other

100 earthquakes in 7 days: What is happening inside the Earth?

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100 earthquakes in 7 days: What is happening inside the Earth?