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				The Fremont Earthquake 
				Exhibit and Earthquake Patio 
				
				In 1962, the 
						building known today as the Fremont Community Center was 
						the original City Hall for the City of Fremont. The 
						building was built on top of 
				
						 the Hayward Fault, and 
						shows signs of creep from buckled beams and structural 
						fractures. In 1972, the first sign of movement was found 
						as a large crack in the council chamber. Today, the 
						large crack continues to move. 
				
				
 
				
				
						
				
						 In 
				Fremont’s Central Park, the movement on the Hayward Fault has 
				caused cracks in asphalt and concrete. The rate of movement is 
				around 5 millimeters per year in the Fremont area, which is 
				enough to visibly move concrete within a few years. The 
				topography of Fremont’s Central Park was partially created by 
				the Hayward Fault. Lake Elizabeth, a constructed lake, was a 
				natural depression caused by movement on the fault.   
				
						The side of the building 
				facing Lake Elizabeth shows several examples of tectonic 
				movement caused by a strike-slip motion along the Hayward Fault. 
				A strike-slip fault is when one land mass moves, nearly 
				horizontally, in the opposite direction of the other on the 
				surface. The movement on the patio reflects larger land 
				structures that are forming throughout Central Park. Lake 
				Elizabeth and Stivers Lagoon (south of lake) are larger depressions, while the hilly areas (north) reflect a 
						compression. Strike-slip faults show transpressional 
						compression (knolls) and  
						transtensional extension 
						(depressions).
 
					
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						| Wood and concrete react differently to constant fault 
						creep.
				
						
						Look at the wood 
						strips between the concrete and notice the 
						wood is bending. As the wood bends, the concrete will 
						crack. | The inside of the 
						building shows
				
						
						
						evidence of accumulated movement since the building  
						was constructed in 1962. Outside, the patio has also
						slowly shifted as seen in the concrete. |  
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						| This knoll was 
						created by opposite movement along the Hayward Fault 
						cousing the gground to bend or fold. The bending or folding 
						action caused land masses to slide past each other 
						creating a compression ridge over time. | Central Park has a rolling 
						topography and depressions. The Knolls are caused 
						when movement of strike-slip faults pushes the earth 
						into a small hill. The pressure causes a movement 
						upward called a positive flower structure. |  
				    
				
				
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