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My interest is in analyzing seismograms to understand how earthquakes work and to quantify the hazards they pose. My research group studies earthquake source processes for shallow earthquakes, intermediate-depth earthquakes, induced earthquakes, and slow earthquakes. We are working to improve earthquake monitoring in all settings by applying data mining and machine learning techniques to large volumes of continuous seismic waveform data. We also work on methods to anticipate the strength of shaking in earthquakes using the ambient seismic field (seismic waves present in the Earth at all times). We use these ambient field measurements to image shallow structure and also to construct "virtual earthquakes" that can be used to anticipate variations in the strength of shaking in real earthquakes. For the past 12 years I have been Deputy-Director/Co-Director of the Southern California Earthquake Center
ResearchMy research group studies earthquakes. We develop and apply techniques for analyzing seismograms to understand how earthquakes work and to quantify the hazards they pose. We have a longstanding interest in understanding the scaling of radiated energy with earthquake size and to understand the mechanics of earthquakes and tectonic tremor. More recently we have embarked on a study of the mechanics of intermediate-depth earthquakes. Some of our research aims to predict the level and variability of strong shaking in large earthquakes by studying weak ground motion in both the ambient seismic field and tectonic tremor.TeachingI teach or co-teach courses for graduate students in seismology and for undergraduates in seismology, earthquake and volcano hazards, and introductory geophysics.Professional ActivitiesLawson Lecturer, (2015), Beno Gutenberg Medal, European Geosciences Union (2014); IRIS-SSA Distinguished Lecturer (2012); Fellow, American Geophysical Union (2008); Co-Director, Southern California Earthquake Center (2014-present); Seismology Section President, American Geophysical Union (2014-2015); Chair, Advanced National Seismic System Steering Committee (2013-present); Chair, IRIS Planning Committee (2010-2013); Plate Boundary Observatory Standing Committee (2004-08); Incorporated Research Institutions for Seismology Executive Committee (2004-06