The following questions are based on the “Mt. Dome, California,” quadrangle (Figure 33-2 found on page 228 of the Laboratory Manual; enlarged to scale 1:48,000; contour interval 40 feet) and the stereogram of the same region (Figure 33-3 found on page 229 of the Laboratory Manual; north is to the left side of the page). Three prominent fault scarps can be seen running north to south across the map, and will be referred to as the “western” fault, the “central” fault, and the “eastern” fault. These fault scarps are the result of normal faulting.
1. Determine the approximate amount of vertical displacement along each of the three fault scarps at their intersection with line AB (when determining the amount of displacement, it may be easiest to count the number of contour lines shown on each scarp to determine the elevation change):
a. Western Fault: _______________ feet
b. Central Fault: _______________ feet
c. Eastern Fault: _______________ feet
2. (a) Is the amount of vertical displacement along the “central fault” uniform from north to south?
_______________
(b) If not, describe the pattern of vertical displacement:
The following questions are based on the “Mt. Dome, California,” quadrangle (Figure 33-2 found on page 228 of the Laboratory Manual; enlarged to scale 1:48,000; contour interval 40 feet) and the stereogram of the same
In order to answer these questions, I would need access to the laboratory manual pages and figures mentioned. As an AI text bot, I don't have access to specific external resources. However, I can provide you with a general approach to solving these types of questions.
1. To determine the approximate amount of vertical displacement along each fault scarp at their intersection with line AB:
- Locate line AB on the map or stereogram.
- Identify the intersection points of line AB with each of the three fault scarps.
- Count the number of contour lines between the points of intersection on each fault scarp to determine the elevation change. Multiply the count by the contour interval (40 feet in this case) to get an approximate vertical displacement for each fault scarp.
2. (a) To determine if the amount of vertical displacement along the "central fault" is uniform from north to south:
- Examine the intersection points of the central fault with line AB at different locations along its north-south extent.
- Compare the count of contour lines and elevation changes between these intersection points.
- If the counts and elevation changes are similar or relatively constant, then the vertical displacement along the central fault is uniform.
(b) In case the vertical displacement is not uniform:
- Observe the pattern of contour lines and elevation changes along the central fault from north to south.
- Look for any variations or trends, such as increasing or decreasing displacement, stepped patterns, or irregularities.
- Describe the observed pattern of vertical displacement, noting any significant variations or trends along the central fault.
Please note that the specific answers to these questions can only be determined by referring to the figures and data in the laboratory manual.
To answer the first question, you need to determine the amount of vertical displacement along each of the three fault scarps at their intersection with line AB. You can count the number of contour lines shown on each scarp to determine the elevation change.
To do this, locate line AB on the map and identify the intersection points of each fault scarp with line AB. Then, count the number of contour lines between the intersection points and determine the elevation change. Each contour line represents a specific elevation, and the contour interval is given as 40 feet in this case. Multiply the number of contour lines by the contour interval to get the approximate amount of vertical displacement along each fault scarp.
For example:
a. Western Fault: Count the number of contour lines between the intersection point on the western fault scarp and line AB, and then multiply it by 40 feet to get the approximate vertical displacement in feet.
b. Central Fault: Count the number of contour lines between the intersection point on the central fault scarp and line AB, and then multiply it by 40 feet to get the approximate vertical displacement in feet.
c. Eastern Fault: Count the number of contour lines between the intersection point on the eastern fault scarp and line AB, and then multiply it by 40 feet to get the approximate vertical displacement in feet.
To answer the second question (a), you need to determine if the amount of vertical displacement along the central fault is uniform from north to south.
To do this, compare the vertical displacements along the central fault at different points along line AB. If the vertical displacements are the same or very similar, then the amount of vertical displacement along the central fault is uniform from north to south. If there are differences in the vertical displacements, then the amount of vertical displacement is not uniform.
For question 2 (b), if the amount of vertical displacement along the central fault is not uniform, you should describe the pattern of vertical displacement. Take note of any variations or trends in the amount of vertical displacement along the central fault from north to south. This could include an increase or decrease in vertical displacement or a pattern of alternating high and low displacements.
Remember to refer to Figure 33-2 and Figure 33-3 in the Laboratory Manual to correctly locate the fault scarps, line AB, and interpret the information provided.