The area of the United States that is the most seismically active is Alaska. After that the states that follow are California, Hawaii, Nevada, Washington, Idaho, Wyoming, Montana, Utah, and Oregon.
Pacific and north america plates
North American Plate and the Pacific Plate.
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You are probably referring to the boundary of the pacific plate which is nick-named the "ring of fire".
every city around san francisco
The physical landscape of mexico affects how the area was shaped because most of it is on the great North American Plate and it is one of the most seismically active regions in the world.
The Pacific Plate and the North American Plate are the names of those two plates.
Yes. Japan is one of the most seismically active countries in the world.
According to the USGS Indonesia is very active seismic zone and has the most earthquakes for a given country while Tonga, Fiji probably has the most earthquakes per unit area. China, Iran, Japan and Turkey are all in seismically active areas and also rank high in number of earthquakes.
Mount Etna in Sicily
The San Francisco Bay Area is one of the most seismically active areas in the North America. There are earthquakes, most small enough to be barely noticeable, on a daily basis. In the 1980's, (October 17, 1989 actually, during the World Series baseball game), a magnitude 6.9 earthquake struck along the Loma Prieta fault causing widespread damage throughout the Bay Area.