Abstract
Synthetic experiments are used to test the applicability of coda wave interferometry (CWI) as a means for estimating distance between sources of nearby earthquakes. Acoustic waves for 45 sources are propagated through a Gaussian random medium. A pair-wise analysis of resulting waveforms illustrates the applicability of CWI as a tool for estimating source separation. Results suggest that, when the waveforms are filtered between 1 and 5 Hz, CWI provides accurate estimates of the separation for source-pairs separated by δ <250 m. The technique provides a lower bound on the actual separation when δ >250 m. The CWI breakdown distance of 250 m is likely to vary with frequency content in the waveforms. The interpretation of CWI source separation estimates is aided by the construction of a conditional probability density function (PDF) P(δt | δCWI), which describes the probability of actual separation δt for given CWI estimates δCWI. The conditional PDF provides a constraint on event separation that is asymmetric. It can be used independently of, or combined with, standard travel-time techniques to improve earthquake location.
Original language | English |
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Pages (from-to) | 189-199 |
Number of pages | 11 |
Journal | Exploration Geophysics |
Volume | 38 |
Issue number | 3 |
DOIs | |
Publication status | Published - Sept 2007 |