California is part of the Pacific Ring of Fire, a horseshoe-shaped region around the Pacific Ocean that is home to about 75% of the world's earthquakes. The San Andreas Fault, which runs through California, is one of the most seismically active faults in the world.
El Salvador is also located in the Pacific Ring of Fire. The country is situated on the Cocos Plate, which is subducting beneath the Caribbean Plate. This subduction process creates a lot of seismic activity, and El Salvador is frequently hit by earthquakes.
The earthquakes that occur in California and El Salvador can cause significant damage and loss of life. In addition to the immediate damage caused by the shaking, earthquakes can also trigger landslides, tsunamis, and other hazards.