Questions 5-10 are based on Figure 13-12 and Google Earth Video 13-#2. The map, imagery and...

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Questions 5-10 are based on Figure 13-12 and Google Earth Video 13-#2. The map, imagery and video show the San Andreas Fault in the Carrizo Plain in central California. Wallace Creek is an extensively studied offset stream along the fault. Smaller offset streams also appear along the fault in this area. You can start off with the Google Earth Video you'll "fly" to the Carrizo Plain near Wallace Creek. In the video, Point 1 and Point 2 show the current offset of Wallace Creek; beyond Point 2 to the northwest a yellow line shows an older, now abandoned offset channel that was displaced 245 meters by the fault. Points 1 to 4 shown in the video are also marked on Figure 13-12. 5. Fly to Point 3. What happens to the tiny gullies on the slopes here when they reach the fault? Why don't they continue on the other side of the fault? 6. 7. 8. 9. 10. Fly to Point 4. This stream channel begins at the fault, sloping downhill to the southwest. It is known as a beheaded stream because it starts abruptly at the fault. What has beheaded this stream? Look for topographic clues that will let you mark the exact trace of the San Andreas Fault on the map to the right (this is the same map in Figure 13-12). The fault runs between the two red arrows, but you can narrow down the position by looking for the location of offset streams, depressions (sag ponds or dry "sags"), tiny hills that align with the fault, and gullies that either stop or start right at the fault. Use a colored line to carefully mark in the position of the San Andreas Fault down the map on the right. Wallace Creek has been offset by 130.0 meters (430.0 feet) to the right along the fault. The age of stream deposits indicates that this offset began 3,700 years ago. Based on these figures, calculate the average rate of movement along this segment of the fault in centimeters per year (or inches per year). Keep in mind that your answer i an estimate of the long-term average, not the expected movement each year: (a) (b) Total offset in centimeters (or inches): centimeters (or inches) Average offset per year: cm/year (or in./yr.) Wallace. Creek ساله inte McKittrick Summit, CA 1:24,000; contour interval 40 ft. The great Fort Tejon earthquake of January 9, 1857 (magnitude 7.8), ruptured a 360-kilometer (220-mile) segment of the San Andreas Fault and produced 10.0 meters (33.0 feet) of offset in this area. Based on the average rate of fault movement calculated in Problem #8b above, estimate how many years of accumulated strain were released during that earthquake. (Note: This answer is based on a very simplistic assumption.) years of accumulated strain Assuming that this segment of the San Andreas Fault ruptures at fairly regular intervals, and palcoscismic studies suggest that this may be true, estimate the year when the next great earthquake might occur along this section of the fault. (Note: This answer is also based on a very simplistic assumption) Approximate year of next great earthquake Wallace Creek الحمد اسانه های بالی McKittrick Summit, CA 1:24,000; contour interval 40 ft. Point 4 Point 2 Point 1 Point 3 McKittrick Summit, CA US Topo imagery (2010) 1:24,000 Figure 13-12: Left: McKittrick Summit, Califomia, quadrangle (original scale 1:24,000; Contour Interval 40 ft); the San Andreas Fault runs approximately between the two red arrows. Right: McKittrick Summit, Califomia, US Topo Imagery. The Mides 13 Point 4 RAZ Point 2 McKittrick Summit, CA US Topo imagery (2010) 1:24,000 Point Point 3 -z Wallace Creek مبله 137 است انی McKittrick Summit, CA 1:24,000; contour interval 40 ft. Questions 5-10 are based on Figure 13-12 and Google Earth Video 13-#2. The map, imagery and video show the San Andreas Fault in the Carrizo Plain in central California. Wallace Creek is an extensively studied offset stream along the fault. Smaller offset streams also appear along the fault in this area. You can start off with the Google Earth Video you'll "fly" to the Carrizo Plain near Wallace Creek. In the video, Point 1 and Point 2 show the current offset of Wallace Creek; beyond Point 2 to the northwest a yellow line shows an older, now abandoned offset channel that was displaced 245 meters by the fault. Points 1 to 4 shown in the video are also marked on Figure 13-12. 5. Fly to Point 3. What happens to the tiny gullies on the slopes here when they reach the fault? Why don't they continue on the other side of the fault? 6. 7. 8. 9. 10. Fly to Point 4. This stream channel begins at the fault, sloping downhill to the southwest. It is known as a beheaded stream because it starts abruptly at the fault. What has beheaded this stream? Look for topographic clues that will let you mark the exact trace of the San Andreas Fault on the map to the right (this is the same map in Figure 13-12). The fault runs between the two red arrows, but you can narrow down the position by looking for the location of offset streams, depressions (sag ponds or dry "sags"), tiny hills that align with the fault, and gullies that either stop or start right at the fault. Use a colored line to carefully mark in the position of the San Andreas Fault down the map on the right. Wallace Creek has been offset by 130.0 meters (430.0 feet) to the right along the fault. The age of stream deposits indicates that this offset began 3,700 years ago. Based on these figures, calculate the average rate of movement along this segment of the fault in centimeters per year (or inches per year). Keep in mind that your answer i an estimate of the long-term average, not the expected movement each year: (a) (b) Total offset in centimeters (or inches): centimeters (or inches) Average offset per year: cm/year (or in./yr.) Wallace. Creek ساله inte McKittrick Summit, CA 1:24,000; contour interval 40 ft. The great Fort Tejon earthquake of January 9, 1857 (magnitude 7.8), ruptured a 360-kilometer (220-mile) segment of the San Andreas Fault and produced 10.0 meters (33.0 feet) of offset in this area. Based on the average rate of fault movement calculated in Problem #8b above, estimate how many years of accumulated strain were released during that earthquake. (Note: This answer is based on a very simplistic assumption.) years of accumulated strain Assuming that this segment of the San Andreas Fault ruptures at fairly regular intervals, and palcoscismic studies suggest that this may be true, estimate the year when the next great earthquake might occur along this section of the fault. (Note: This answer is also based on a very simplistic assumption) Approximate year of next great earthquake Wallace Creek الحمد اسانه های بالی McKittrick Summit, CA 1:24,000; contour interval 40 ft. Point 4 Point 2 Point 1 Point 3 McKittrick Summit, CA US Topo imagery (2010) 1:24,000 Figure 13-12: Left: McKittrick Summit, Califomia, quadrangle (original scale 1:24,000; Contour Interval 40 ft); the San Andreas Fault runs approximately between the two red arrows. Right: McKittrick Summit, Califomia, US Topo Imagery. The Mides 13 Point 4 RAZ Point 2 McKittrick Summit, CA US Topo imagery (2010) 1:24,000 Point Point 3 -z Wallace Creek مبله 137 است انی McKittrick Summit, CA 1:24,000; contour interval 40 ft.

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