The San Andreas Fault forms part of the border between two of Earth's tectonic plates: the Pacific Plate and the North American Plate. This location has experienced significant and frequent seismic activity throughout recorded history. Scientists have discovered that one area of the fault in California creates a significant earthquake once every 22 years. Other areas have also suffered devastating earthquakes over the years, including devastating quakes in 1906 and 1989. Readers will be enthralled by the engaging text and dazzling photographs inside this book. The text is also supplemented by maps and primary sources.