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Student Researcher: Kevin Kwong Thesis Advisor: Keith Koper

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. Imaging Earthquake Rupture From Back-Projecting Body Waves.

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Student Researcher: Kevin Kwong Thesis Advisor: Keith Koper

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  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 Ishii 2011 Peter Shearer 2009

  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

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