Question

The evolution of the San Andreas Fault System over the last 30 million years shown in the figure next page was determined...

Post-lab exercise # 5: Plate Tectonics (show you ork). 4pts. he evolution of the San Andreas Fault System over the last 30 million years shown in the figure next page was determined by studying a variety of geological data, including magnetic stripes on the seafloor, the timing of volcanic activity in the area, and offset geologic formations. Be sure to have the summary of plate tectonics chart handy for this part. (Figure from http://pubs.usgs.gov/publications/text/Farallon.html). NOTE: Evidence suggests the Pacific plate is currently moving past the North American plate at a rate of about 3.5 cm/year. B. During what time (in millions of years) would you expect active volcanoes near Los Angeles? Why C. Should the volcanoes be active today? Why or why not? Angeles to reach San Francisco. Distance between Los Angeles and San Francisco in cm (note scale bar on lower right corner of map marked present) Remember: D- VT Time

Answer 1

a. Along with the transform faults there are little spread centres near the los Angeles which may spit off volcanic matter and hence we can expect volcanism near los Angeles in very short time geologically.

b. At present there is only presence of transform fault and ni spreading ridge near the los Angeles so there is no volcanism.

c. Distance between los Angeles and San Fransisco is 3 cm on the map.