P-waveform analysis for local subduction geometry south of Puget Sound,Washington |
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| Authors: | David B Lapp Thomas J Owens Robert S Crosson |
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| Institution: | (1) Geophysics Program AK-50, University of Washington, 98125 Seattle, WA, USA;(2) Present address: Geomatrix Consultants, One Market Plaza, Spear St. Tower, Suite 717, 94105 San Francisco, CA, USA;(3) Department of Geology, University of Missouri, 65211 Columbia, MO, USA;(4) Present address: Department of Geological Sciences, University of South Carolina, 29208 Columbia, SC, USA |
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| Abstract: | The local subduction geometry at a site south of Puget Sound in western Washington is investigated using teleseismicP-waveforms recorded on a three-component event triggered seismograph. The data are processed using source equalization deconvolution in order to isolate locally convertedP-to-S arrivals and stacked to improve the signal-to-noise ratio. Stable arrivals in the radial component indicate an oceanic Moho within the subducted slab at a depth of about 53 km beneath the station. Observed amplitude variations with azimuth in the radial data, as well as qualitative aspects of the tangential data, are used to establish a slab dip of 16° to the southeast. Our results are compatible with previous results from a site 60 km to the west, and further confirm a substantial warp in the regional geometry of the subducted Juan de Fuca plate. |
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| Keywords: | Cascadia subduction receiver functions P-waves converted phases seismic structure |
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