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<br />A. <br /> <br />B. <br /> <br />C. <br /> <br />D. <br /> <br />E. <br /> <br />F. <br /> <br />G. <br /> <br />H. <br /> <br />CONTENTS <br /> <br />Background .................................................. <br /> <br />Purpose ...................................................... <br /> <br />Scope ........................................................ <br /> <br />Fac tors to Consider in the Se1ec tion of De sign Earthquakes <br /> <br />1. <br />2. <br />3. <br />4. <br />5. <br />6. <br /> <br />Regional Tectonic Setting ............................... <br />Seismic History ......................................... <br />Seismotectonic Structures............................... <br />Local or Site Geology ................................... <br />Be ismic Attenuation ..................................... <br />Reservoir-Induced Seismicity ............................. <br /> <br />Selection of Design Earthquakes ............................ <br /> <br />1. <br />2. <br />3. <br />4. <br /> <br />Maximum Credible Earthquake ............................ <br />Controlling Maximum Credible Earthquake ................ <br />Maximum Design Earthquakes ............................. <br />Operating Basis Earthquake ......................... <br /> <br />Charac terization of Ground Motion Expec ted at the Site <br /> <br />..... <br /> <br />1. <br />2. <br />3. <br />4. <br />5. <br /> <br />Peak Ground Motion Parameters .......................... <br />J)u ra t ion ............................................... <br />Response Spectra....................................... <br />Acceleration Time-Histories ............................ <br />Uncertainties in Ground Motion Design Values ........... <br /> <br />Earthquake Analyses ........................................ <br /> <br />1- <br />2. <br />3. <br /> <br />Need for and Extent of Analyses ........................ <br />Conc re te Dams .......................................... <br />Enbankrnent Da.ms ........................................ <br /> <br />Evaluating Structural Adequacy for Earthquake Loading <br /> <br />1- <br />2. <br />3. <br />4. <br />5. <br /> <br />Performance Criteria ................................... <br />Evaluation of Analyses Results for Concrete ,Dams....... <br />Evaluation of Analyses Results for Enbankment Dams..... <br />Past Experience of Dams Shaken by Earthquakes .......... <br />Evaluation of Existing Dams ............................ <br /> <br />-3- <br /> <br />Page <br /> <br />5 <br /> <br />5 <br /> <br />6 <br /> <br />8 <br /> <br />8 <br />8 <br />9 <br />10 <br />10 <br />11 <br /> <br />11 <br /> <br />11 <br />12 <br />12 <br />12 <br /> <br />13 <br /> <br />13 <br />14 <br />14 <br />16 <br />17 <br /> <br />17 <br /> <br />17 <br />18 <br />22 <br /> <br />27 <br /> <br />27 <br />27 <br />29 <br />29 <br />32 <br />