F. Waldhauser co-developed double-difference earthquake relocation with W. Ellsworth. The method combines ordinary arrival-time data with precise waveform-based differential measurements, then adjusts relative source positions to fit those differences.[ref]
A Double-difference Earthquake Location Algorithm: Method and Application to the Northern Hayward Fault, California by F. Waldhauser and W. Ellsworth. Abstract: combined catalogue/cross-correlation observations and iterative solution
Closely related waveforms provide useful timing information through cross-correlation. Combining those observations with a network of stations can reveal structure within a seismic cluster that a collection of independently located events would blur.
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