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The San Andreas fault line is a crack where two tectonic plates, (or areas of earth that move around), are sliding past each other, and that is called a transform boundary.

When parts of rock get stuck, and lets say 10 years pass and something cracks under pressure, all of the stress that was building up in those 10 years will be released all at one time, and it will move to the spot it would be very quickly, and the waves will go out from the focus,( or area where the earthquake was caused,) and those are called seismic waves.

Seismic waves are waves that are from the focus, and they are like when you throw a rock into a pond, and the waves go out, rippling across the pond. Those waves are what we feel when they get to us. and there are 3 types of seismic waves.

1. P waves.- the fastest waves, and they do not go on the surface, but they do jolt the ground in an Accordion fashion.

2. S waves.- the second fastest waves, and they do not go on the surface, but they do jolt the ground in a side to side fashion.

3. Surface waves.- the slowest waves, and they do go on the surface which makes them the most destructive and violent, and they go in a rolling fashion.

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14y ago

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What occur along a fault?

Earthquakes occur along a fault. Near the San Andreas fault lots of earthquakes occur.


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Earthquakes occur along the San Andreas Fault because of the tectonic plates. When the plates slip or shift, an earthquake happens.


How many earthquakes occur along the San Andreas fault each year?

AnswerAccording to the USGS, the plates along the San Andrea fault move about 1.7in per year.


Do most earthquakes occur under the ocean floor or on land?

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