The first time that the San Andres fault acered was in 1857 and 1905. It happened in western California. The San Andres fault was when 2 tectonic plates met in western California and they started to move closer together. Both of the plates keep coming closer and started to touch. A lot of the earthquakes occurred there. When this happens the land was starting to swallow up into a bottomless pit.
There are already 4 other san andreas faults that had occurred where the first one did. All of these were made from 2 plates colliding together. When the two plates collide they make things from the biggest mountain ranges to the smallest crevices. This has moved rivers and has changed mnts.. For example, many people driving near Crystal Springs Reservoir, near San Francisco, or along Tomales Bay, or through Cajon or Tejon Passes may not realize that they are within the San Andreas fault zone. On the ground, the fault can be recognized by carefully inspecting the landscape. The fault zone is marked by distinctive landforms that include long straight escarpments, narrow ridges, and small undrained ponds formed by the settling of small blocks within the zone. Many stream channels characteristically jog sharply to the right where they cross the fault.
The San Andreas Fault is a continental transform fault that extends roughly 810 miles through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). The San Andreas fault is about 28 million years old. Back then, California didn't exist, at least not recognizably so. Bits and pieces could be found scattered around the western edge of North America, which at the time ended at the Pacific ocean lapping the shores of central Utah and Arizona. Other parts were volcanic islands in the eastern Pacific.
Thank you for hering everything that i had to say about the san andreas fault.