The SAFZ is the main part of the boundary between the Pacific tectonic plate on the west side and the North American plate on the east side. The SAFZ started moving about 28-30 million years ago and has horizontally slipped (transform motion) a total of about 300-350 km (186-220 mi)since it began moving. Scientists have a good big picture understanding of the San Andreas Fault Zone (SAFZ). First, let's zoom out and look at the big picture. Since we have exceeded the average, many people use the term “overdue,” but it’s more complicated than that. The data show that at many places along the San Andreas Fault, we have gone past the average time between large earthquakes. Public domain.)Įarth scientists have been gathering data at key paleoseismic sites along sections of the San Andreas Fault to figure out the past timeline of earthquakes at each spot. ![]() The red line is traced on a fault that offsets the layers. The horizontal colored lines highlight different layers of sediment. Exposure of the San Andreas Fault in a trench.
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