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Northern California shaken by more than a dozen earthquakes in a single morning

Thursday, 29 June 2017

 

At least 16 earthquakes were registered near the town of Truckee in Northern California, about 200 miles northeast of San Francisco. According to the US Geological Survey (USGS), the first temblor hit the area at about 2:00 a.m., while the strongest shake had a magnitude of 3.9.

A group of UC Berkeley seismologists says that heavy rain and snow this winter has contributed to the earthquakes, which were centered in the Sierra mountains. They say the excessive mass of water and snow puts enough pressure on the mountains to make them move and flex as the water begins to run off and dry out, triggering the earthquakes.

Johnson and his team looked at more than three-thousand earthquakes over a nine-year period and found a pattern — exceptionally wet winters cause an uptick in smaller quakes, their recent study says.

This conclusion is challenged by Graham Kent, the director of the Nevada Seismological Lab.

According to the USGS, more than 40 minor earthquakes have hit the Truckee area since the start of the month.

Source by: Internet

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