1-5 QUESTIONS Apparent Sea Level Changes Along the Southern California Coast I.
ID: 289575 • Letter: 1
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1-5QUESTIONS Apparent Sea Level Changes Along the Southern California Coast I. In addition to uplift and subsidence of continental crust along the coast by plate tectonic activity, and the rising and falling of sea level related to glaciation cumstances could produce an expansion in ocean volume, and tion episodes, what other cir- a rise in sea level? Use Figures 13.29, 13.30, and 13.31 to answer the following questions: 2. The white squares in Figure 13.29 are positioned on gently sloping surfaces and indicate the posi- tion of nine terraced levels of the present land surface on San Pedro Hill. They mirror the Pleisto- cene wave-cut beach surface underneath the sediment cover. What do the steeper slopes in be- tween represent? 3. Assign a relative age to each of the terraces using the numerals 1 through 9, 1 being the oldest and 9 being the youngest. Write a number above each white square in Figure 13.29. Based on how you numbered the nine terraces, did each form in sequence as sea level rose or as sea level dropped? Which seems logical? a. b. 4. Given that each of the nine wave-cut surfaces ascending the flank of San Pedro Hill were at sea level when each was formed during the Pleistocene Epoch, there should be the same number of terraces all along the uplands of the California coast, but there are not. How can there be nine sea level changes only on the Palos Verdes Peninsula and not preserved anywhere else? What other ogic mechanism must have operated since Pleistocene time in order to form the nine terraces on San Pedro Hill? A clue to answering this question is in the aerial photograph of the Palos Verdes Peninsula (Figure 13.32) Figure 13.32 erial view to the San Gabriel lMountaina north of the Palos Verdes Peninsula, principal geographic features and the Palos Verdes Fault. Letter D s downthrown side and letter U is upthrown side of the Palos Verdes Los Angeles coustal plain Patos permission Palos Verdes Pnsida Laboratory 13: The Coust: Proceses and Hazards 157
Explanation / Answer
Question 1.
Factors affecting sea level rise and fall are as follows apart from tectonic and glaciation factors:
1. Tidal force generated due to gravity of Sun depending on location of sea directly towards sun or away from the sun.
2. Due to gravity of moon tidal forces are generated which can lead rise of sea level during particular period of time.
3. Due to sedimentation in oceans the accomodation space decreases which forces the available volume for water to reside to decreasing leading to sea level rise in response.
4. Global warming increases average sea temperatures making water expand leading to sea level rise in long term.
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