Beyond receiver functions: Passive source reverse time migration and inverse scattering of converted waves
Author(s)Shang, Xuefeng; Hoop, Maarten V. de; van der Hilst, Robert D.
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We present a wave equation prestack depth migration to image crust and mantle structures using multi-component earthquake data recorded at dense seismograph arrays. Transmitted P and S waves recorded on the surface are back propagated using an elastic wave equation solver. The wave modes are separated after the reverse-time continuation of the wavefield from the surface, and subjected to a (cross-correlation type) imaging condition forming an inverse scattering transform. Reverse time migration (RTM) does not make assumptions about the presence or properties of interfaces – notably, it does not assume that interfaces are (locally) horizontal. With synthetic experiments, and different background models, we show that passive source RTM can reconstruct dipping and vertically offset interfaces even in the presence of complex wave phenomena (such as caustics and point diffraction) and that its performance is superior to traditional receiver function analysis, e.g., common conversion point (CCP) stacking, in complex geological environments.
DepartmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Geophysical Research Letters
American Geophysical Union (AGU)
Shang, Xuefeng, Maarten V. de Hoop, and Robert D. van der Hilst. “Beyond Receiver Functions: Passive Source Reverse Time Migration and Inverse Scattering of Converted Waves.” Geophysical Research Letters 39.15 (2012). ©2012 American Geophysical Union
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