Rotational motions in seismology [Elektronische Ressource] : theory, observation, modeling / vorgelegt von Nguyen Dinh Pham

Ludwig-Maximilians-Universität München ROTATIONAL MOTIONS IN SEISMOLOGY: THEORY, OBSERVATION, MODELING Dissertation zur Erlangung des Doktorgrades der Fakultät für Geowissenschaften der Ludwig-Maximilians-Universität München vorgelegt von Nguyen Dinh Pham am 23. Juli 2009 1. Gutachter: Prof. Dr. Heiner Igel 2. Gutachter: Prof. Dr. Ulrich Schreiber Tag der mündlichen Prüfung: 05/11/2009 Contents Acknowledgments vSummary viiIntroduction 1Chapter 1. The Effects of Tilt on Interferometric Rotation Sensors 7 Abstract 7 1.1 Introduction 8 1.2 Tilt - Ring Laser Coupling: Theory 9 1.2.1 Observations of Local Earthquakes 111.2.2 Observations of Tele-Seismic Events 16 1.3 Tilt - Ring Laser Coupling: Observations in the P Coda 19 1.4 Discussion and Conclusions 23Chapter 2. Observations and Modeling of Rotational Signals in the 27P Coda: Constraints on Crustal Scattering Abstract 27 2.1 Introduction 28 2.2 Observations 29 2.2.1 Database 292.2.2 Frequency Dependence of Direct Observations 30 i ii CONTENTS 2.2.3 Increase in Correlation Right After the Onset of P 33Wave 2.2.4 Frequency Dependence of Correlation 332.2.5 Directional Dependence of Correlation 35 2.2.6 Envelopes 412.2.7 Energy Equipartitioning 41 2.3 Modeling 45 2.3.1 P-SH Scattering in the 3D Random Crust 462.3.2 Topographic Scattering 52 2.