A formulation of directivity for earthquake sources using isochrone theory by Paul Spudich and others Created 2026-10-24 Updated 2026-11-05
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United States Geological Survey Open-File Report 2004-1268. Paul Spudich and coauthors derive a finite-source directivity measure from the distribution of arrival times across a rupturing fault. The explanatory discussion links apparent pulse compression to the rate at which radiation from successive patches reaches a receiver. pubs.usgs.gov/of/2004/1268/of2004-1268tagged.pdf
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