105Lab10Earthquakes - Geol 105 Lab 10 Faults and...

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Geol 105 Lab 10 Faults and Earthquakes week of March 26-30, 2012 INTRODUCTION PART I. Movie time (seismic wave propagation in LA basin) Before you view the movies, compare the geography – “Major Earthquakes and Fault Zones of California” and “Southern California topography” -- just to get oriented. “SeismicPropagation” illustrates amplitude of seismic waves. “LAbasin1” illustrates S-wave intensity from a hypothetical earthquake at a point on the Newport-Inglewood Fault. In this hypothetical case, the Los Angeles basin is composed of homogeneous rock (remember – this is a hypothetical situation). This is like tossing a pebble into a pond, and watching the waves move outwards. “LAbasin2” illustrates S-wave intensity in a basin composed of many different rock types – which more closely represents the true geology of the Los Angeles basin. You are watching the waves as they move out from a short rupture along a portion of the Newport-Inglewood Fault. Notice the extreme peaks and where they occur. What areas of Los Angeles experience greater amplitude S-waves? Give a hypothesis as to why this is so. PART II. Seismograms (a record of how the earth moves) This poster is a record of seismic waves passing by two particular stations – Villa Park Dam, and Mt. Wilson. The seismic waves are passing by a stationary instrument, in contrast to the movies of PART I, where you were watching waves going out in all directions from the fault. The stations are approximately equal distance from the epicenter. Examine the two seismograms. How are they different and why? (think about the movie) 1 of 10
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PART III: Hazards of Geologic Foundations The material upon which structures are built also exerts a strong control on how buildings will respond to shaking during an earthquake. Liquefaction experiment 1. Compare the behavior of the various objects as assigned by your instructor. Write your observations for each object. 2. What happens to the buried golf ball when the shake table is turned on? What household object might this be analogous to? (hint: think about an item below ground in the backyard of many homes) 3. What happens to the wood block during liquefaction? How might one go about safeguarding a
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This note was uploaded on 04/02/2012 for the course GEOL 105 taught by Professor Platt,davis during the Spring '08 term at USC.

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105Lab10Earthquakes - Geol 105 Lab 10 Faults and...

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