San Andreas System
Origin: Mendocino triple junction, Cascadia subduction zone, seismicity, fold-thrust belt
Geometry: fault strands, offset streams, restraining bend (compression, ridges, reverse faults or thrust faults, folding), releasing bend (extension, sag ponds, pull apart basins)
History: northern San Andreas, Mendocino to Hollister, 4 major strands: Rodgers Creek, Hayward, Calaveras, various reverse faults, 1989 Loma Prieta M7.1 - strike slip and reverse motion, 1906 San Francisco M 8.2?, sediment related damage
central San Andreas, fault creep releases strain, Parkfield - 22 year recurrence of M6
Carrizo Plain, 1857 Fort Tejon M8.2?
Big Bend - Transverse ranges, restraining bend, reverse faults and thrust faults, Northridge
How and when did the San Andreas fault form? How is it related to the Cascadia subduction zone and the Mendocino triple junction?
Compare and contrast restraining bends and releasing bends. How do they form? What stresses occur? What faults and other features are associated with each?
Compare and contrast the fault history of the four main regions of the San Andreas system:
· Northern and San Francisco region
· central region
· Carrizo Plain
· Big Bend region