= F. Waldhauser
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<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.<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]{ref}
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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