Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5371
AuthorsLa Rocca, M.* 
Creager, K. C.* 
Galluzzo, D.* 
Malone, S.* 
Vidale, J. E.* 
Sweet, R.* 
Wech, G.* 
TitleCascadia Tremor Located Near Plate Interface Constrained by S Minus P Wave Times
Issue Date30-Jan-2009
Series/Report no./ 323(2009
DOI10.1126/science.1167112
URIhttp://hdl.handle.net/2122/5371
KeywordsCascadia Tremor
Plate Interface Constrained
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics 
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes 
AbstractNonvolcanic tremor is difficult to locate because it does not produce impulsive phases identifiable across a seismic network. An alternative approach to identifying specific phases is to measure the lag between the S and P waves. We cross-correlate vertical and horizontal seismograms to reveal signals common to both, but with the horizontal delayed with respect to the vertical. This lagged correlation represents the time interval between vertical compressional waves and horizontal shear waves. Measurements of this interval, combined with location techniques, resolve the depth of tremor sources within T2 kilometers. For recent Cascadia tremor, the sources locate near or on the subducting slab interface. Strong correlations and steady S-P time differences imply that tremor consists of radiation from repeating sources.
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