Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3407304c&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 7, CiteID L07304
Physics
3
Seismology: Body Waves, Seismology: Continental Crust (1219), Seismology: Lithosphere (1236), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Subduction Zones (1207, 1219, 1240)
Scientific paper
Seismic interferometry to date has focussed on surface waves, due to paucity of deep, high-frequency noise sources. Here, we investigate use of non-volcanic tremor on the Cascadia subduction zone as a noise source to recover scattered body-wave contributions to the Green's function. Tremor data for 2004-2005 recorded at Polaris-BC stations TWKB, MGCB and LZB were filtered and cross-correlated. TWKB and MGCB correlations generate a highly reproducible arrival at 4.5 s for combinations of vertical with radial or transverse components. TWKB and LZB correlations are less reproducible, but yield a strong arrival at 3.5 s for 2005. Upon consideration of source/receiver geometry, polarity and timing, we interpret these arrivals to represent reflection-conversions. Arrival times imply that these signals originate at depths between 9 and 12 km, coincident with an interval of strong reflectivity imaged in the 1987 Lithoprobe Southern Cordillera transect.
Bostock Michael G.
Chaput J. A.
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