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The Assessment of Seismic Safety for the Planned Trans-strait Passage of the Bohai Strait

LI Ping,YANG Mei-e,ZHAO Dong-zhi(Institute of Geology,China Earthquake Administration,Beijing 100029,China)  
The island chain between the Liaodong Peninsula and Shandong Peninsula is an uplifted part of the continental shelf of eastern China.The Tanlu fault zone separates this shelf from the mainland of China,which subducts toward east into the sea,while the Tanlu fault zone is sinking.West of the planned Trans-strait Passage of the Bohai Strait,the Tanlu fault is highly active with frequent earthquakes which can reach 8.5 in magnitude.Thus the design and construction of this trans-strait passage must consider the earthquake hazard.The seismogenic fault has a certain width and clear boundaries.The possible peak accelerations of seismic ground motion are quite different inside and outside the fault,and their seismic intensities may differ as much as 2—3 degrees or more.The trans-strait passage is a lifeline engineering.Fortunately,it is about 40km away from the Tanlu fault zone.It is better to use the deterministic method to evaluate the seismic motion parameters in the design of the passage.
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