Question

California has been plagued with earthquakes over the centuries; earthquakes that are a severe danger to life and land. Earthquakes are prevalent because in California

Answer 1

in California has two tectonic plates which are the Pacific Plate and the North American plate, the Pacific plate moves past the North American plate about two inches each year.

Further Explanation:

California is known to be capable to produce earthquakes which are of as high intensity as magnitude of 8 and in recent times, It's tectonic plates have started to move for the first time on record. The 160 mile long Garlock fault which is on the northern edge of the Mojave district, never observed the production of earthquake or large or even a small magnitude. But a recent satellite radar image has shown that over the last few years, there has been movement on that fault which is causing a bulging of land which can be viewed even from the space.  

Along with the Garlock fault, there is one more major concern that is able to produce Earthquake of 8 magnitudes in California. That is, there is a potential ripening fault zone which goes along with the Eastern California Shear Zone which is known to carry state’s most seismic zones and takes because of that, the most of the burden which comes because of the earthquake is absorbed  which is needed to accommodate tectonic plate movement as in California.

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Answer Details:

Grade: High School

Chapter: Tectonic Plates

Subject: Geography

Keywords: Earthquake, Tectonic plates, California, Magnitude, Intensity, Eastern Zone, Seismic Zone, Garlock fault.

Answer 2

There are a few reasons why earthquakes are so common in California. First of all California has many, many fault lines. Also in California there are two plates the Pacific Plate and the North American plate, the Pacific plate moves past the North American plate about two inches each year. The strain of the two plates also contributes to the earthquakes.
Hope it helps!