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http://hdl.handle.net/2122/5371
Authors: | La Rocca, M.* Creager, K. C.* Galluzzo, D.* Malone, S.* Vidale, J. E.* Sweet, R.* Wech, G.* |
Title: | Cascadia Tremor Located Near Plate Interface Constrained by S Minus P Wave Times | Journal: | Science | Series/Report no.: | / 323(2009 | Publisher: | the American Association for the Advancement of Science | Issue Date: | 30-Jan-2009 | DOI: | 10.1126/science.1167112 | Keywords: | Cascadia Tremor Plate Interface Constrained |
Subject Classification: | 04. 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 |
Abstract: | Nonvolcanic 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. |
Appears in Collections: | Article published / in press |
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