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Some earthquakes on San Andreas fault are triggered by gravitational tug of sun and moon

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The gravitational tug between the sun and moon is not just a dance of high and low tides: It can also trigger a special kind of earthquake on the San Andreas fault.
This phenomenon has fascinated scientists for years. Like sea levels, the surface of the Earth also goes up and down with the tides, flexing the crust and stressing the faults inside. Further study found that during certain phases of the tidal cycle, small tremors deep underground – known as low-frequency earthquakes – were more likely to occur.
http://www.latimes.com/science/sciencenow/la-sci-sn-la-me-earthquakes-tides-san-andreas-20160718-snap-story.html