M5.1 earthquake followed by swarm of 22 earthquakes shakes Upper Lake, California

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A shallow magnitude 5.1 earthquake followed by a swarm of 22 smaller tremors hit Tuesday evening 11 miles from Upper Lake, California.

The moderately strong temblor occurred at 7:57 p.m. Pacific time (2:57 UTC) at a depth of 11.2 miles (14.4km).

M5.1 earthquake california august 9 2016, M5.1 earthquake california august 9 2016 news, M5.1 earthquake california august 9 2016 map, M5.1 earthquake california august 9 2016 video, M5.1 earthquake california august 9 2016 pictures
via USGS

The epicenter of the M5.1 quake was situated 19km (11.8 miles) NNE of Upper Lake, California and 85 miles from Sacramento.

About one hour later, the swarm of 22 small quakes started in the exact same region.

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via USGS

M1.7 – 20km NNE of Upper Lake, California
M2.7 – 19km NE of Upper Lake, California
M1.4 – 17km NE of Upper Lake, California
M1.7 – 17km NE of Upper Lake, California
M1.9 – 21km NNE of Upper Lake, California
M3.0 – 20km NNE of Upper Lake, California
M1.5 – 20km NNE of Upper Lake, California
M1.6 – 20km NNE of Upper Lake, California
M2.0 – 20km NNE of Upper Lake, California
M2.1 – 21km NNE of Upper Lake, California
M2.2 – 19km NE of Upper Lake, California
M2.3 – 19km NNE of Upper Lake, California
M2.3 – 19km NNE of Upper Lake, California
M2.1 – 19km NNE of Upper Lake, California
M2.2 – 19km NNE of Upper Lake, California
M2.4 – 20km NNE of Upper Lake, California
M1.9 – 20km NNE of Upper Lake, California
M1.9 – 20km NNE of Upper Lake, California
M2.0 – 20km NNE of Upper Lake, California
M2.2 – 21km NNE of Upper Lake, California
M2.4 – 20km NNE of Upper Lake, California

But if you look on the California earthquake map, another swarm of 21 tremors occurred to the south of the State.

earthquake california august 10 2016, earthquake swarm california august 10 2016
via USGS

This second series was located around Cobb and The Geysers. The amplitude of the quakes ranged between M0.4 and M2.6.

earthquake swarm california august 9 2016, earthquake swarm california august 9 2016 cobb, earthquake swarm california august 9 2016 the geyser, earthquake swarm california august 9 2016 southern california
via USGS

In the meantime, a M3.8 tremor hit 34km W of Rancho Tehama Reserve, California.

All quakes are aligned vertically. What is going on?

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