Spectral damping scaling factors for shallow crustal earthquakes in active tectonic regions

................................................................................................................................. iii ACKNOWLEDGMENTS ............................................................................................................ v TABLE OF CONTENTS ........................................................................................................... vii LIST OF FIGURES ..................................................................................................................... ix LIST OF TABLES ..................................................................................................................... xiii 1 INTRODUCTION............................................................................................................. 1 1.1 7B ackground and Scope of the Project 1 1.2 8BDifferent Approaches to Modeling of Damping Scaling 2 1.3 9BOrganization of the Report 5 2 1BGROUND MOTION DATABASE .................................................................................. 7 3 2BGENERAL OBSERVED TRENDS .............................................................................. 11 3.1 10BInfluence of Damping and Period on DSF 11 3.2 11BInfluence of Duration, Magnitude, and Distance on DSF 14 3.3 12BInfluence of Site Conditions and Tectonic Settings on DSF 19 4 3BMODEL DEVELOPMENT ........................................................................................... 21 4.1 13BDistribution of DSF 21 4.2 14BFunctional Form for Median DSF 24 4.2.1 17BRelevant Functional Forms Used in Literature 24 4.2.2 The Proposed Model 25 4.3 15BStandard Deviation 32 4.4 16B eyond 50 kilometers 33 5 4BCOMPARISON WITH DATA AND WITH EXISTING MODELS ......................... 39 6 5BVERTICAL COMPONENT MODEL .......................................................................... 47 7 6BCONCLUSIONS ............................................................................................................. 59 REFERENCES ............................................................................................................................ 61

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