Last lecture
Historical behavior of San Andreas fault
We’ve looked at only a few of the interesting historical earthquakes!
Meade and Hager [2005]
34±3 mm/a
3,700 a
25±3 mm/a
5,900-14,500 a
16±3 mm/a
5,900-14,500 a
Lecture 21: The San Andreas fault
Neotectonic overview (continued)
• Loma Prieta 1989
• The San Gorgonio Pass jog
San Andreas fault
Uplift rates between 0.13 and 0.35 mm/a
Nominal Loma Prieta earthquakes every 300-600 years
442 earthquakes to produce the 125,000-year terrace
San Gorgonio Pass stepover
What are the actual kinematics?
The first step in answering this question is to understand the 3-D geometry of the fault system
What is happening in the San Bernardino Mountains?
Where are the active structures on the san Gorgonio Pass side of the San Bernardino mountains?
Active faults and topo of the region
1986 eq
Broad antiformal warps
Contours on base of seismicity