California's seismic activity is the result of the many active faults it lies upon, most prominantly, the San Andreas Fault. One of the reasons that California has so many earthquakes is that the San Andreas fault has a "bend" that creates large amounts of friction as the plates slide next to each other.
They have frequent earthquakes because other countries have earthquakes then waves from that flow to islands creating an earthquake. The earthquake then triggers a volcano.
In California, there are frequent earthquakes
Because it could be by the plates that are active and have more frequent earthquakes.
Frequent shallow earthquakes
Frequent shallow earthquakes.
This is because earthquakes and tremors are common in Japan. That triggers tsunamis to occur
Sea floor spreading.
Ring of Fire
i dont no the answer..!
Ocean Trench
The ring of fire
The most frequent number of earthquakes in U.S. are in Alaska followed by California.