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Ambient noise interferometry is a branch of seismology which extracts useful information from the ambient seismic field that always exists on Earth, and which was traditionally regarded as noise. Full-wave or generalized ambient noise interferometry, is a rigorous modelling-based approach, which aims to overcome the pitfalls associated with the widely used assumption of Green's function retrieval from interstation cross-correlations. Instead, it seeks to invert for noise sources as well as Earth structure, by explicitly modelling the cross-correlation waveforms themselves. Waveform attributes are related to source and structure parameters, through finite frequency sensitivity kernels. This talk will describe implementation of full-wave ambient noise interferometry for ambient noise source inversion.
As a cryoseismology application of this technique, I will describe the first passive seismic experiment on the Satopanth glacier in Uttarakhand, India. The Satopanth glacier is one of the many debris-covered glaciers in the Himalayas, which are now recognized to be best understood via coupled models of debris-ice dynamics. With the aim of building such a model for the Satopanth glacier, we are trying to use ambient noise seismology to map the subglacial bed and identify sub-glacial drainage channels. I will present early results from this ongoing work. |