# Activity II : Southern California The following map shows the…

Activity II: Southern California
The following map shows the position of the San Andreas Fault (SAF). There is a plate boundary between the North American Plate (east side) and the Pacific Plate (west side).
The legend shows different types and ages of rocks where the older rocks are shown at the bottom of the legend in green (Cretaceous). Yellow (Quaternary) are the youngest rocks on this map. The colored bodies of rock used to match each other on either side of the fault. (11.5 pt)
What type of plate boundary is the San Andreas Fault? You can use your textbook for help. (0.5 pt)
2. Calculate the rate of movement of the fault by measuring the Oligocene volcanic rocks (orange) in cm/yr. (Ma = m.y. = millions of years) The fault became active 20 million years ago. Your distance measured will be in the numerator and 20 m.y. in the denominator. Rate = distance divided by time. SHOW YOUR MATH. (2 pt)
Step 1: Lay a piece of scratch paper on the map below so that the edge of the paper is along the fault.
Step 2: Put a tick mark at the start (left side) of each of the Ov orange blobs.
Step 3: Bring your scratch paper to the scale at the bottom of the map. Determine the distance in kilometers.
Step 4: Divide your distance by 20 m.y. (Hint: your answer will be a two-digit number in km/m.y.)
Step 5: Convert to cm/yr. To do this, first multiply your answer in Step 4 by 100,000 cm/km and divide by 1,000,000 yr/m.y. In your conversion math, both km and m.y. will “cancel out” and you’ll be left with cm/yr. Please show all math.
3. Now calculate the rate of fault movement in cm/yr for the Oligocene sedimentary rocks (brown) with the same five steps you used in the previous question. SHOW YOUR MATH. (2 pt)
4. What is the average rate in cm/yr? PLEASE SHOW YOUR MATH. (1.5 pt) 