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Earthquake Lab:. S. The lag time for St. Louis is 21 seconds. P. Features associated with the San Andreas Fault. Fault Scarps Steep mountain fronts Offset streams (Dogleg streams) Sag ponds and lakes Valleys in fault zones Changes in rock type. Offset fence Point Reyes. - PowerPoint PPT Presentation
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Earthquake Lab:
The lag time for St. Louis is 21 secondsP
S
•Fault Scarps
•Steep mountain fronts
•Offset streams (Dogleg streams)
•Sag ponds and lakes
•Valleys in fault zones
•Changes in rock type
Offset fence
Point Reyes
Fault Scrap in the Mecca Hills, Southern California
Fault scarp
Fault Scrap Central California
scarp
Linear ridge
Offset stream
Linear valley
Spot the clues that would tell a geologist if she was walking in this area that a fault-line is here.
Color in rock types Tc,and Tnv
What do they tell you?
When did these fault-lines roughly last move?
Using Tnv, calculate the speed of movement since the middle of the eocene.
Tnv
TnvTnv
Qos
Loma Prieta
A. Seismicity (1969-89) before Loma Prieta
B. Loma Prieta earthquake and aftershocks
San Jose could be next!
Cross-section of Loma Prieta Earthquake
Intensities of 1906 San Francisco earthquake