1. Large Earthquake Rupture Imaging Using the Back-Projection Technique and Improving the Array Response Function Student Researcher: Kevin Kwong Thesis Advisor: Keith Koper Ishii et al. 2005

2. Imaging Earthquake Rupture From Back-Projecting Body Waves The back-projection method traces seismic waves back to their original rupture source. We use specifically teleseismic P waves We locate sources of rupture by looking at regions in space and time that show relative high amplitudes Back-projection imaging resolve important rupture parameters and details that can be used to inform public and tsunami warning systems Peter Shearer 2009 Ishii 2011

3. Resolving Complex Rupture Details We stack the seismograms and sum the energy to a beam to resolve local maximum energy releasing peaks Koper et al., 2011

4. Imaging Artifacts Artifacts in time and space can complicate back-projection images The smearing and leakage of energy in space and time is a big concern that relates in how the array distorts the image and results in a less optimal Array Response Function (ARF) IRIS back projection results for 2010 Chile event

5. Mitigating Artifacts We will devise methods to suppress imaging artifacts and deconvolve back-projection images Looking at artifacts in back-projected aftershock events Station weighting for resolving optimal array response functions Keith Koper, Personal Communication